Updated for 2026
A tennis serve can travel so quickly that the returner has only a fraction of a second to react.
At recreational level, breaking 100 mph already feels explosive.
Professional players regularly move well beyond that.
The biggest servers in tennis history have reached:
140 mph
150 mph
and, in one extraordinary case:
more than 160 mph.
The fastest recognized men’s tennis serve belongs to Sam Groth, who was clocked at:
263 km/h — 163.4 mph
during an ATP Challenger event in Busan, South Korea, in 2012.
For women, the official WTA and Guinness benchmark belongs to Sabine Lisicki:
210.8 km/h — 131 mph
at Stanford in 2014.
There is also a faster women’s measurement.
Spain’s Georgina García Pérez was clocked at:
220 km/h — 136.7 mph
in 2018.
However, that speed is classified as an unofficial record, which is why Lisicki continues to hold the recognized WTA mark.
That distinction matters.
Serve-speed records are not as simple as checking one universal database. Different tournaments have used different radar systems, speeds have not always been measured on every court, and some spectacular readings were never officially accepted.
So what is the fastest tennis serve ever?
Who owns the men’s and women’s records?
How fast did Isner, Roddick, Karlovic and Serena Williams serve?
And does the fastest server automatically have the best serve?
Let’s separate the records from the myths.
What Is the Fastest Tennis Serve Ever?
The Guinness-recognized men’s record belongs to:
Sam Groth — 263 km/h (163.4 mph)
Groth produced the serve on:
May 9, 2012
at an ATP Challenger tournament in:
Busan, South Korea.
His opponent was:
Uladzimir Ignatik.
The serve was an ace.
Groth also produced two other enormous readings during the same match:
255.7 km/h
and
253.5 km/h.
Yet there is an amusing detail behind the record.
Groth lost the match:
6–4, 6–3.
The fastest serve ever recorded did not even produce a victory.
Fastest Men’s and Women’s Tennis Serves
Here are the two recognized headline records:
| Category | Player | Speed |
|---|---|---|
| Men’s recognized record | Sam Groth | 263 km/h / 163.4 mph |
| Women’s official WTA record | Sabine Lisicki | 210.8 km/h / 131 mph |
There is also an important women’s unofficial mark:
| Player | Recorded Speed | Status |
|---|---|---|
| Georgina García Pérez | 220 km/h / 136.7 mph | Unofficial record |
That difference between recorded and officially recognized is central to understanding tennis serve-speed history.
Sam Groth — 163.4 MPH
Sam Groth was an Australian player whose serve became his defining weapon.
He stood well over six feet tall and produced an explosive motion capable of generating enormous racket-head speed.
But even by his standards, what happened in Busan was extraordinary.
One serve registered:
263 km/h.
Converted to miles per hour:
163.4 mph.
No recognized men’s tennis serve has surpassed it.
Why Groth’s Record Is Unusual
The record did not happen at:
Wimbledon,
US Open,
Australian Open,
Roland-Garros,
or an ATP Masters 1000.
It happened at an:
ATP Challenger event.
Challengers sit below the main ATP Tour level but remain professional tournaments featuring world-ranked players.
That sometimes creates confusion when people ask:
“What is the fastest ATP serve?”
Groth’s record was produced in professional ATP Challenger competition rather than a main-tour ATP event.
For the broad question fastest recognized tennis serve, however, Groth’s 263 km/h remains the benchmark.
Did Sam Groth Really Serve 263 KM/H?
Yes.
Guinness World Records recognizes the serve.
Groth’s own ATP biography also historically noted that he hit the fastest serve on record at the Busan Challenger in May 2012.
The measurement was:
263 km/h
or approximately:
163.4 mph.
But serve records require some caution because radar equipment and measurement methods can differ between tournaments.
That is why responsible comparisons should identify:
the speed,
the tournament,
and whether the record is officially recognized.
How Fast Is 163.4 MPH?
To understand the number, consider the time available to return it.
A tennis court is:
78 feet long.
The server does not strike the ball from the baseline itself — contact occurs inside the court after the player jumps upward and forward.
The ball also slows after leaving the racket and after bouncing.
Even so, a serve traveling at more than 160 mph gives the returner very little time to:
recognize direction,
move,
prepare the racket,
and make clean contact.
Returning elite serving is therefore partly prediction.
Players watch:
ball toss,
shoulder position,
racket path,
court positioning,
and previous serving patterns
before the ball even leaves the strings.
John Isner — One of the Fastest Elite Servers Ever
John Isner built one of the greatest serving careers professional tennis has seen.
In main-tour competition, he was clocked at approximately:
155 mph — 249 km/h.
That places him among the fastest reliably measured servers at ATP Tour level.
But raw speed tells only part of his serving story.
Isner also accumulated enormous numbers of:
aces,
service holds,
tiebreaks,
and extremely short service points.
His height allowed him to strike the ball from an unusually high contact point.
That created both:
speed
and
angle.
Isner’s Serve and the Longest Tennis Match Ever
Isner appears in another record on our site for a reason.
At Wimbledon in 2010, he faced Nicolas Mahut in the longest tennis match ever.
The match lasted:
11 hours and 5 minutes.
Isner hit:
113 aces.
Mahut hit:
103.
Combined:
216 aces.
The fifth set ended:
70–68.
That match demonstrates something important about serving.
A great serve does more than create highlight-reel speed readings.
It can repeatedly protect a player from being broken for hours.
Andy Roddick — 152 MPH
Andy Roddick possessed one of the most famous serves of the early 2000s.
His abbreviated motion looked almost violent.
The ball toss went up.
The racket accelerated rapidly.
And the entire movement happened with very little wasted time.
Roddick was measured at approximately:
152 mph — 244.6 km/h
during the 2004 US Open.
For several years, he was closely associated with the world serve-speed record.
Roddick Used Speed as a Weapon, Not a Stunt
One of the interesting things about Roddick’s serve was that he did not simply attempt maximum speed on every point.
A great server needs:
placement,
spin,
accuracy,
disguise,
and tactical awareness.
A 140 mph serve aimed perfectly at the body or sideline may be much more effective than a 150 mph serve placed where the returner expects it.
Roddick understood that distinction.
His serve was powerful.
More importantly:
it won points.
Ivo Karlovic — A Serving Giant
Ivo Karlovic stood approximately:
6 feet 11 inches — 2.11 meters.
That height gave him an extraordinary serving contact point.
Karlovic was at one time clocked at around:
251 km/h — 156 mph
during Davis Cup competition.
The measurement was widely reported as a record before Groth’s 2012 serve.
Karlovic’s greatest serving achievement, however, was not one radar reading.
It was his ability to produce enormous serving numbers:
season after season.
Why Height Helps Tennis Servers
Taller players have several natural serving advantages.
Higher Contact Point
A taller player can strike the ball farther above the court.
That creates a steeper downward angle into the service box.
More Margin
Because of the contact height, big servers can combine speed with greater clearance over the net.
Longer Levers
Longer arms can contribute to racket-head speed when combined with efficient technique.
But height alone does not create a great serve.
Timing and coordination still matter enormously.
Milos Raonic — Power Plus Precision
Milos Raonic was another player whose serve became central to his entire game.
He was recorded around:
151 mph — 243 km/h
in ATP competition.
Raonic combined:
power,
placement,
and high first-serve effectiveness.
His serving ability helped him reach:
the Wimbledon final
and:
World No. 3.
That career reinforces an important point:
the best servers are not necessarily the players who produce one freakishly fast reading.
The best servers create repeatable advantages across thousands of points.
What Is the Fastest Women’s Tennis Serve?
For the recognized WTA record, the answer is:
Sabine Lisicki — 131 mph
or:
210.8 km/h.
Lisicki produced the serve on:
July 29, 2014
at the WTA tournament in:
Stanford, California.
Her opponent was:
Ana Ivanovic.
The speed remains the official WTA benchmark.
Sabine Lisicki — 131 MPH
Lisicki was one of women’s tennis’s most naturally powerful servers.
Her aggressive game was particularly dangerous on grass.
She reached the:
2013 Wimbledon final
and defeated several elite opponents at the tournament during her career.
Then in 2014, Stanford produced the number that became attached permanently to her name:
131 mph.
Lisicki Lost the Record-Setting Match
Just like Groth, Lisicki did not win the match in which she set the speed record.
She lost to:
Ana Ivanovic.
That produces an interesting parallel.
Fastest men’s recognized serve:
record set in defeat.
Fastest official women’s serve:
record set in defeat.
It is the perfect reminder that one spectacular shot cannot decide an entire tennis match.
What About Georgina García Pérez’s 136.7 MPH Serve?
This is where women’s serve records become confusing.
At the:
2018 Hungarian Ladies Open
Georgina García Pérez was clocked serving:
220 km/h
or:
136.7 mph.
That is substantially faster than Lisicki’s 131 mph.
So why isn’t García Pérez simply listed as the official record holder?
Because the measurement is treated as:
unofficial.
Official vs Unofficial Women’s Serve Record
The cleanest way to present the record is:
Fastest official WTA serve
Sabine Lisicki — 210.8 km/h / 131 mph
Faster unofficial recorded serve
Georgina García Pérez — 220 km/h / 136.7 mph
Guinness maintains separate listings reflecting that distinction.
So if someone asks:
“What is the fastest women’s serve ever recorded?”
García Pérez’s 220 km/h deserves to be mentioned.
If they ask:
“What is the official WTA record?”
the answer remains:
Sabine Lisicki.
Why Was García Pérez’s Serve Not Treated as the Official WTA Record?
Serve-speed technology is not perfectly standardized across every professional event.
For a record to receive universal recognition, organizations need confidence in:
calibration,
equipment,
measurement location,
and verification.
When those conditions are not fully accepted, a speed may be reported without replacing the official tour record.
That is why our rankings should never simply copy the largest number found online.
The context matters as much as the speed.
Serena Williams — Power That Won Championships
Serena Williams was capable of serving above:
125 mph
and was recorded around:
207 km/h — 128.6 mph
during her career.
She was not the official women’s speed-record holder.
Yet there is a powerful argument that Serena possessed one of the greatest serves in women’s tennis history.
Why?
Because her serve combined:
power,
placement,
accuracy,
disguise,
and performance under pressure.
Fastest Serve vs Greatest Serve
This distinction is crucial.
The question:
Who hit the fastest serve?
asks for one maximum speed.
The question:
Who had the greatest serve?
asks something far more complicated.
A great serve needs to work:
at break point,
in a tiebreak,
on second serve,
late in a match,
and across years of competition.
One 160 mph missile is spectacular.
A serve that produces championships is more valuable.
Venus Williams and the Evolution of Women’s Serving
Venus Williams also helped change expectations around serving speed in women’s tennis.
She was measured around:
207.6 km/h — 129 mph
at the US Open.
Her height, reach and explosive motion allowed her to generate extraordinary pace.
Alongside Serena, Venus helped normalize a more aggressive style of women’s serving in which the first serve could be an attacking weapon rather than simply a way to begin the point.
Why Do Serve-Speed Records Differ Between Sources?
Search for the fastest tennis serves online and you may find conflicting lists.
That does not necessarily mean someone is lying.
Several technical issues create disagreement.
Different Radar Systems
Tournament equipment has changed over time.
Not every radar system measures speed in exactly the same way.
Different Measurement Positions
The ball is fastest immediately after leaving the racket.
It begins slowing because of air resistance.
Where the speed is measured therefore matters.
Not Every Court Tracks Serve Speed
A huge serve on an outside court may never receive an official radar measurement.
That creates a sampling problem.
We know the fastest serves that were measured.
We cannot know every serve ever hit.
Equipment Calibration
A radar reading is only as reliable as the system producing it.
Extraordinary readings may face additional scrutiny before becoming recognized records.
Tour-Level vs Challenger vs Davis Cup
Different lists may include or exclude:
ATP Tour matches,
ATP Challenger matches,
Davis Cup,
qualifying,
exhibitions,
or unofficial events.
That can change the answer dramatically.
Is Sam Groth’s Serve an ATP Tour Record?
The best description is:
Groth owns the recognized overall men’s serve-speed record from professional ATP Challenger competition.
His 263 km/h serve was not produced in a main ATP Tour event.
That is why some lists separate:
overall professional record
from:
ATP Tour-level record.
When writing about speed records, stating the competition level prevents unnecessary confusion.
Why Sam Groth’s Record May Be Difficult to Break
At first glance, serve speed seems like a record that should keep increasing.
Players become stronger.
Training improves.
Rackets evolve.
Sports science improves.
But 163.4 mph is an extreme number.
To break it, a player needs:
exceptional height or biomechanics,
very high racket-head speed,
perfect timing,
a relatively flat first serve,
and reliable measurement equipment.
Most importantly, elite players usually prioritize:
effective serving
rather than chasing radar numbers.
Winning the point matters more than reaching 165 mph.
How Fast Is an Average Professional Men’s Serve?
There is no single universal average because serve speeds vary by:
player,
surface,
tournament,
first vs second serve,
and tactical situation.
But elite men’s first serves commonly travel somewhere around:
110–130+ mph
with the biggest servers regularly moving above:
140 mph.
A 150 mph serve remains rare even in professional tennis.
That puts Groth’s 163.4 mph measurement into perspective.
How Fast Is an Average Professional Women’s Serve?
Elite women’s first serves are generally slower than men’s but still exceptionally fast.
Many leading WTA players can serve:
100–115+ mph
while the biggest servers can exceed:
120 mph.
Breaking 125 mph places a player into exceptionally powerful territory.
Lisicki’s:
131 mph
official record sits well beyond normal tour speeds.
First Serve vs Second Serve Speed
Players almost always hit the first serve harder.
Why?
Because tennis gives them:
two attempts.
A missed first serve still leaves a second chance.
That allows the server to use:
more pace,
flatter trajectories,
and smaller targets.
The second serve usually adds:
more spin,
more net clearance,
and more safety.
Why Players Don’t Serve at Maximum Speed Every Time
Imagine a player can serve:
150 mph.
That does not mean 150 is always the best choice.
Serving at maximum speed can reduce:
accuracy,
first-serve percentage,
spin,
and disguise.
A 135 mph serve placed on the sideline may be harder to return than a 150 mph serve aimed directly at the returner’s strike zone.
Serving is not simply a speed competition.
It is:
speed + placement + spin + variation.
Flat Serve vs Slice Serve vs Kick Serve
The type of serve affects speed.
Flat Serve
Usually produces the highest raw velocity.
Less spin is used.
Common on aggressive first serves.
Slice Serve
Adds sideways spin.
Can pull an opponent away from the court.
Often slower than the fastest flat serve.
Kick Serve
Uses heavy topspin.
The ball jumps higher after bouncing.
Frequently used as a safer second serve.
The fastest serve records therefore usually come from:
flat first serves.
What Makes a Tennis Serve Fast?
Raw serving speed comes from an entire kinetic chain.
It does not begin with the arm.
Leg Drive
Players push upward from the court.
The legs create the foundation of the motion.
Hip and Trunk Rotation
Energy travels from:
legs,
through hips,
into the torso.
Efficient rotation adds speed without forcing the arm to create everything alone.
Shoulder Rotation
The shoulder moves rapidly through the serving motion.
Elite servers combine flexibility with strength and timing.
Racket Drop
The racket falls behind the body before accelerating upward.
This creates a long acceleration path.
Pronation
Near contact, the forearm and racket rotate explosively.
This helps convert the stored energy into racket-head speed.
Contact Height
A high contact point helps the player hit both:
fast
and
downward into the service box.
That is one reason tall players appear frequently on fastest-serve lists.
Does a Faster Serve Always Mean More Aces?
No.
Aces depend heavily on:
placement,
disguise,
returner ability,
surface,
spin,
and anticipation.
A perfectly placed 125 mph serve can produce an ace.
A predictable 145 mph serve can be returned.
This is why players such as:
Federer,
Serena,
Sampras,
and Djokovic
could serve extremely effectively without owning the raw speed record.
Why Federer Was Such an Effective Server Without Being the Fastest
Roger Federer’s serve rarely challenged the extreme speed records of Groth, Isner or Roddick.
Yet it was one of the most effective parts of his game.
Federer used:
nearly identical ball tosses,
different placements,
slice,
flat serves,
body serves,
and excellent disguise.
Returners often reacted late because they could not easily read where the serve was going.
That is an example of:
serve quality beating raw velocity.
Why Djokovic’s Serve Improved With Age
Novak Djokovic built his early career primarily around:
returning,
movement,
baseline consistency,
and defense.
His serve later became more efficient.
That improvement helped him:
shorten points,
protect energy,
and remain competitive deeper into his career.
It demonstrates another lesson about serving:
players do not need record-breaking velocity to create a major advantage.
Technical efficiency can be more valuable.
The Fastest Serve at Wimbledon
Wimbledon has historically produced huge serves because grass rewards aggressive serving.
The Guinness-recorded men’s Wimbledon speed benchmark is:
238 km/h — 148 mph
by:
Taylor Dent
at Wimbledon 2010.
Grass itself does not necessarily make the ball leave the racket faster.
But the surface can make big serving more effective after the bounce.
Why Grass Rewards Big Servers
Grass usually produces:
lower bounces,
faster points,
and less reaction time after the ball contacts the court.
A powerful serve therefore becomes even more dangerous.
That is one reason serving legends such as:
Sampras,
Federer,
Becker,
Ivanisevic,
and Isner
have been particularly dangerous on grass.
What Is More Important: Serve Speed or Serve Placement?
For elite players:
placement is usually more important.
Speed helps.
But the returner is already accustomed to enormous pace.
What becomes difficult is:
a serve into the corner,
a serve into the body,
a wide slice,
followed by a serve up the T.
Variation creates uncertainty.
Uncertainty makes reaction slower.
Can a Tennis Serve Reach 170 MPH?
No recognized tennis serve has reached:
170 mph.
Groth’s 163.4 mph record remains below that threshold.
Could somebody eventually reach it?
Physically, perhaps.
But the player would need to exceed an already extreme benchmark by almost:
7 mph.
At that level, every additional mile per hour becomes increasingly difficult.
Could Someone Break Groth’s Record?
Yes.
No record is guaranteed forever.
But several factors make it difficult.
First, 263 km/h is already extreme.
Second, serving purely for speed is not usually strategically useful.
Third, the reading needs to occur under conditions that allow it to be:
measured,
verified,
and recognized.
A future player could hit something faster.
Proving it officially is another part of the challenge.
Could the Women’s Official Record Fall Soon?
Possibly.
Modern women’s tennis features several enormous servers.
Players are:
stronger,
more athletic,
and increasingly comfortable using the first serve as an aggressive weapon.
But Lisicki’s:
131 mph
has survived since:
2014.
And even the unofficial García Pérez mark of:
136.7 mph
is an enormous target.
Serve Speed and Tennis Technology
Comparing modern numbers with players from decades ago is difficult.
Why?
Older champions did not benefit from:
modern radar systems,
modern graphite rackets,
polyester strings,
advanced strength training,
or today’s biomechanics research.
We therefore cannot fairly say:
“Groth definitely served faster than every player who ever lived.”
A more accurate statement is:
Groth owns the fastest recognized recorded men’s serve.
The word:
recorded
matters.
Could Pete Sampras Have Served Faster With Modern Equipment?
There is no reliable way to know.
Sampras possessed one of the greatest serves in tennis history.
But comparing his peak speeds with modern radar readings is complicated by:
measurement technology,
equipment changes,
and different tournament systems.
The same problem applies to earlier champions such as:
Pancho Gonzales,
Rod Laver,
and Bill Tilden.
Historical greatness and radar records are not the same thing.
How Serve Speed Changed Modern Tennis
Huge serving helped change how points were constructed.
Against an elite server, returners may have only one realistic goal:
put the ball back into play.
That created players whose service games were exceptionally difficult to break.
It also increased the importance of:
tiebreaks,
return positioning,
and taking advantage of rare break-point opportunities.
Fast Serves and Tiebreak Tennis
Big servers often produce more tiebreaks because:
both players hold serve repeatedly.
If neither creates a break:
6–6 arrives.
Then a handful of points can decide the set.
That means a massive serve brings advantages but also creates pressure.
One poor service point in a tiebreak can erase an entire set of dominant serving.
Fastest Serve vs Most Aces
These are related but completely different records.
Fastest serve
Measures:
one serve’s maximum speed.
Career aces
Measures:
how many serves opponents failed to touch across an entire career.
A player can own the speed record without owning the ace record.
And a player with slightly less maximum velocity may hit far more aces through:
placement,
consistency,
and longevity.
That distinction will become especially important when comparing tennis’s career ace leaders.
Does the Serve Matter in the Tennis GOAT Debate?
Absolutely.
But speed alone should have very little weight.
A great serve contributes to:
free points,
service holds,
shorter rallies,
energy conservation,
and pressure on the returner.
What matters is how effectively the serve helps a player win matches.
Sam Groth owns the raw speed record.
That does not place him ahead of Federer, Sampras or Djokovic as an overall server or player.
One number cannot do that.
For our broader evaluation framework, read How Is the Greatest Tennis Player of All Time Determined?.
Fastest Tennis Serve FAQ
What is the fastest tennis serve ever?
Sam Groth holds the Guinness-recognized men’s record at 263 km/h (163.4 mph).
When did Sam Groth hit the fastest serve?
May 9, 2012.
Where did Groth hit the record serve?
At an ATP Challenger tournament in Busan, South Korea.
Did Groth win the match?
No.
He lost to Uladzimir Ignatik 6–4, 6–3.
What is the fastest official women’s tennis serve?
Sabine Lisicki’s 210.8 km/h (131 mph) serve at Stanford in 2014.
Who did Lisicki play when she set the record?
Ana Ivanovic.
Did Lisicki win that match?
No.
Ivanovic won.
Has a woman served faster than 131 mph?
Georgina García Pérez was clocked at 220 km/h (136.7 mph) in 2018, but that measurement is classified as an unofficial record.
What is the fastest women’s unofficial serve?
Georgina García Pérez — 220 km/h / 136.7 mph.
How fast did John Isner serve?
Isner was measured around 155 mph / 249 km/h in ATP Tour competition.
How fast did Andy Roddick serve?
Approximately 152 mph / 244.6 km/h.
How fast did Milos Raonic serve?
Approximately 151 mph / 243 km/h.
How fast did Ivo Karlovic serve?
Karlovic was famously clocked around 156 mph / 251 km/h in Davis Cup competition.
How fast did Serena Williams serve?
Serena reached speeds around 128–129 mph / 207 km/h.
How fast did Venus Williams serve?
Venus was measured around 129 mph / 207.6 km/h.
Can a tennis serve exceed 160 mph?
Yes.
Sam Groth’s recognized record is 163.4 mph.
Has anyone served 170 mph?
No recognized professional tennis serve has reached 170 mph.
Why do fastest-serve lists disagree?
Different events have used different radar systems and verification standards, and serve speed has not historically been measured on every court.
Is the fastest serve automatically the best serve?
No.
Placement, accuracy, spin, disguise, consistency and pressure performance matter more across an entire career.
Is Sam Groth’s record from an ATP Tour tournament?
It came at an ATP Challenger event, which is professional competition below the main ATP Tour level.
What is the fastest serve at Wimbledon?
Guinness lists Taylor Dent at 238 km/h / 148 mph during Wimbledon 2010.
Final Answer: What Is the Fastest Tennis Serve Ever?
The fastest recognized men’s tennis serve belongs to:
Sam Groth.
Speed:
263 km/h
or:
163.4 mph.
Groth produced it at the:
2012 Busan ATP Challenger
against:
Uladzimir Ignatik.
For women, the official WTA record belongs to:
Sabine Lisicki.
Speed:
210.8 km/h
or:
131 mph.
She hit it at:
Stanford 2014
against:
Ana Ivanovic.
There is one important qualification.
Georgina García Pérez was clocked at:
220 km/h / 136.7 mph
during 2018 Hungarian Ladies Open qualifying.
That is faster than Lisicki’s mark but is classified as an:
unofficial record.
So the clearest way to remember the records is:
Men — Sam Groth: 263 km/h / 163.4 mph
Women, official — Sabine Lisicki: 210.8 km/h / 131 mph
Women, unofficial — Georgina García Pérez: 220 km/h / 136.7 mph
But serve speed is only one part of great serving.
Groth hit the fastest recorded serve.
Isner built an enormous serving career.
Roddick turned his serve into one of the defining weapons of his era.
Serena used hers to win 23 majors.
Federer relied on placement and disguise more than record speed.
And Sampras built one of tennis’s greatest pressure serves without needing a 160 mph radar reading.
The radar tells us:
who hit hardest once.
Tennis history tells us:
who served best when it mattered.
Who Had the Greatest Serve in Tennis History?
Was it the record-breaking speed of Groth?
Isner’s height and ace production?
Roddick’s explosive power?
Sampras under pressure?
Federer’s disguise?
Serena Williams in championship moments?
The fastest serve is measurable.
The greatest serve is a much more interesting debate.
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Tags: Andy Roddick, Fastest Tennis Serve, John Isner, Sabine Lisicki, Sam Groth, Serve Speed, Tennis History, tennis records