Which Tennis Serves Hold the Recognized Speed Records?

The fastest recorded tennis serve is Sam Groth’s 263 km/h (163.4 mph) delivery, hit at an ATP Challenger event in Busan, South Korea, on May 9, 2012. The women’s record recognized by Guinness World Records and the WTA is Sabine Lisicki’s 131 mph (210.8 km/h) serve, struck at Stanford in 2014. John Isner’s 157 mph serve is a record within the narrower scope of ATP Tour and Davis Cup competition, not the fastest reading across all professional events.

Tennis does not have one universal, tour-administered serve-speed record book covering every level of competition and every measurement system. The accurate answer therefore depends on whether “record” means the highest recorded professional speed, the ATP Tour and Davis Cup mark, or the WTA record.

Choose two record serves and a unit to see their speeds, difference and competition scope.

Record scope	Player	Recorded speed	Event and date
Fastest recorded men’s serve	Sam Groth	263 km/h (163.4 mph)	Busan ATP Challenger, May 9, 2012
ATP Tour and Davis Cup competition	John Isner	253 km/h (157 mph)	Davis Cup at Kooyong, March 6, 2016
Fastest WTA serve	Sabine Lisicki	131 mph (210.8 km/h)	Stanford, July 29, 2014

Speeds in the table are shown as published by the cited record keepers. Conversions can differ slightly in other reports because the published km/h and mph figures are not always calculated and rounded in the same direction.

Sam Groth Hit the Fastest Recorded Men’s Serve

Groth produced the 263 km/h reading during a second-round match against Uladzimir Ignatik at the Busan ATP Challenger. Guinness World Records lists the serve at 263 km/h, or 163.4 mph, and identifies it as an ace.

The reading was not an isolated spike surrounded by ordinary speeds. Two more Groth serves in the same match were measured at 255.7 km/h and 253.5 km/h. Both exceeded the previous 251 km/h mark attributed to Ivo Karlovic. Those additional readings supported the conclusion that Groth was serving at exceptional speed during the match, although they do not eliminate the broader problem of comparing equipment between events.

Groth did not win the match. Ignatik defeated him 6-4, 6-3 despite the record ace and the two other readings above 253 km/h. That result illustrates the limited meaning of a single maximum-speed figure. The record identifies the fastest measured delivery; it does not describe Groth’s performance over every service point or show whether his overall serving was more effective than his opponent’s play.

A maximum also says nothing by itself about first-serve percentage, placement, double faults or the share of service points won. One extraordinary delivery can establish a speed record even when the server loses the set and match. Groth’s mark should therefore be read as an extreme measurement, not as evidence that this was the best complete serving performance in professional tennis.

The ATP Did Not Maintain a Universal Speed Record

Groth’s 263 km/h mark is often described as the world record, but “fastest recorded professional serve” is the more precise label. Contemporary reporting said the ATP confirmed that the Busan event used approved equipment and that its other readings appeared normal. The same reporting also said the tour did not officially recognize serve-speed records because radar systems could vary from event to event (ABC News/Reuters).

That distinction does not mean the Busan reading should be discarded. Guinness recognizes it, it occurred in professional competition, and multiple serves from the match registered at unusually high speeds. The caveat concerns comparability and ATP administration: the tour was not certifying one standardized, all-events record category under identical measurement conditions.

“Official ATP world record” consequently implies more than the available evidence supports. It suggests that the ATP maintained and certified a universal category encompassing Challenger, tour-level and other professional matches. The contemporary account says it did not. “Guinness-recognized fastest recorded men’s serve” or “fastest recorded professional serve” preserves both the achievement and the measurement qualification.

Competition level matters here. Busan was an ATP Challenger event. Excluding Challenger results creates a different record category, which is why a slower serve can properly be called a record in ATP Tour and Davis Cup competition without displacing Groth’s higher raw reading.

John Isner Holds the Narrower Competition Mark

John Isner served at 253 km/h (157 mph) against Bernard Tomic during the United States’ 2016 Davis Cup tie with Australia at Kooyong. Contemporary coverage called it the fastest serve in “ATP Tour and Davis Cup history,” surpassing Karlovic’s 251 km/h benchmark (ESPN).

Isner’s figure is lower than Groth’s 263 km/h reading. The two claims can coexist because they describe different pools of matches. Groth’s record includes his Challenger match; the label attached to Isner’s serve covers ATP Tour and Davis Cup competition.

Removing that scope produces a misleading comparison. Calling Isner’s serve the fastest ever ignores the higher Busan reading. Calling the Isner claim false ignores the stated restriction under which it was reported. The event category must travel with the number: Groth holds the highest recorded professional speed, while Isner owns the cited ATP Tour and Davis Cup mark.

The same care applies to Karlovic’s 251 km/h benchmark. It was the figure Isner surpassed within the competition history described by contemporary coverage, while Groth had already received a higher reading at Challenger level. A list that combines the numbers but omits their scopes makes the sequence look contradictory when it is not.

Sabine Lisicki Holds the WTA Serve Record

Lisicki clocked 131 mph (210.8 km/h) against Ana Ivanovic in the first round of the 2014 Bank of the West Classic at Stanford. Guinness World Records dates the serve to July 29, 2014, and the WTA player profile identifies 131 mph as the fastest serve in WTA history. Reuters reported that the WTA treated the delivery as a new record.

Ivanovic reached the serve but sent the return wide. Lisicki went 6-5 ahead in the opening set, then lost the match 7-6, 6-1. As with Groth’s record, the match result prevents the peak speed from being mistaken for a summary of the full contest.

The return also means Lisicki’s record serve was not an ace. A measured serve does not have to pass untouched to qualify as a speed record. It has to be a legal serve with a recorded speed. Whether the returner touches the ball determines how the point is described, not how fast the serve traveled. See the distinction between an ace and a service winner.

The previous WTA main-draw mark was Venus Williams’ 129 mph serve at the 2007 US Open. Alycia Parks later matched that US Open-specific record in 2021, according to the tournament’s official account. The 129 mph figure remains below Lisicki’s 131 mph WTA record.

Here again, the scope prevents an apparent conflict. Parks tied the US Open record associated with Williams; she did not tie the overall WTA mark attributed to Lisicki. “US Open record” and “WTA record” are not interchangeable labels, even though both concern women’s serve speed.

A Record Serve Is Not Necessarily an Ace

Groth’s record delivery was an ace, while Lisicki’s was touched and returned wide. The contrast shows that serve speed and point classification answer separate questions.

The speed record concerns the radar reading attached to a legal delivery. An ace requires the returner not to touch the serve before losing the point. A return that makes contact but fails to land in play can still follow a record-speed serve, as Lisicki’s point did, but it is not recorded as an ace under that distinction.

Nor must a record serve decide the match. Both Groth and Lisicki lost the matches in which they set their marks. Their records remain valid descriptions of those individual deliveries. The losses simply limit what can be inferred from the records about match-level serving success.

This is why ace totals and serve speed should not be treated as substitutes. A player can produce a very fast serve that comes back, or win an untouched point with placement rather than a personal maximum. Peak pace describes one physical extreme; point and match statistics describe outcomes over a larger sample.

Measurement Scope Limits All-Time Comparisons

Serve-speed comparisons are strongest when the player, number, event and record scope are stated together. Radar placement, equipment and reporting precision have not been uniform across every tournament or era. The ATP’s stated concern about variation between radar systems is particularly relevant when readings from different competition levels are placed in one ranking.

Older players also competed before speed tracking became common. An all-time list of serve speeds is therefore a list of measured and reported deliveries, not proof that every player in tennis history had an equal opportunity to register a comparable number. “Fastest recorded” is more defensible than claiming that the reading conclusively identifies the fastest serve anyone has ever hit under any conditions.

Published unit conversions require similar restraint. Groth’s record is commonly presented as 263 km/h and 163.4 mph, Isner’s as 253 km/h and 157 mph, and Lisicki’s as 131 mph and 210.8 km/h. Those paired figures should be retained as the record keepers published them rather than repeatedly converted and rounded into superficially more precise alternatives.

Peak Speed Does Not Rank the Best Servers

A serve-speed record captures one delivery. Evaluating a server requires repeatable measures across many points, including average first-serve speed, first-serve percentage, first-serve points won, ace rate and double faults. Placement and the ability to protect break points can matter without appearing in a maximum-speed list.

The match results attached to the records make the limitation concrete. Groth hit a 263 km/h ace but lost in straight sets. Lisicki reached 131 mph and moved ahead 6-5 in the first set, but Ivanovic won the match. Neither result diminishes the speed mark; both show why the mark should not become a general ranking of serving quality.

For comparisons beyond these records, professional serve-speed baselines provide more useful context than a single maximum. The record answer remains scope-dependent: Groth has the highest recorded men’s professional reading, Isner has the cited ATP Tour and Davis Cup mark, and Lisicki holds the WTA record.