The fastest tennis serve ever, and what counts as average

The fastest tennis serve ever recorded is Sam Groth's 163.7 mph (263.4 km/h), hit at a Challenger event in Busan in May 2012. Most official lists stop lower, around 157 mph, because they only count certain events. Real-world averages sit far below both.

The fastest tennis serve on record

Groth's serve came in a first-round Challenger match in Busan, South Korea. The reading has held up under more than a decade of scrutiny since — it's still the number tennis writers and record-keepers reach for when the question is "fastest ever," official recognition or not.

Other extreme readings from the same stretch of years get mentioned alongside it — Frenchman Albano Olivetti's name turns up on more than one "fastest serves" list from 2012, also clocked at a Challenger — though none of these secondary figures carry any more official standing than Groth's does.

The names on the lists the tours themselves promote are lower:

• John Isner — 157.2 mph (253 km/h), 2016 Davis Cup against Australia.
• Ivo Karlović — 156 mph (251 km/h), 2011 Davis Cup in Zagreb.
• Andy Roddick — 155 mph (249.4 km/h), 2004 Davis Cup, the benchmark everyone quoted for the better part of a decade.

Every one of those came in a Davis Cup tie rather than a regular tour event — a hint that the venue and its equipment matter as much as the arm.

Why the fastest serve in tennis has more than one answer

Nothing ratifies a serve speed. There's no equivalent of athletics' certified timing, no wind gauge, no verification panel. A number exists because a machine at that venue printed it.

Three things move it:

Hardware. Older events used Doppler radar positioned behind the baseline; many now use camera-based ball tracking. The two don't always agree, and a spread of a few mph between them is normal.

Aim and placement. Radar reads only the component of speed along its own line of sight, so a gun offset from the ball's path under-reads. One that latches onto a fast-moving racket head instead of the ball over-reads.

Whose list it is. Challenger, qualifying, and exhibition readings usually don't enter tour record pages at all. That's how Groth's serve manages to be both the highest figure ever recorded and absent from the ATP's own leaderboard.

Treat any single mph figure as what that venue's equipment said on that day, not as a physical constant.

The fastest serve in women's tennis

• Georgina García Pérez — 220 km/h (136.7 mph), Budapest 2018. The highest figure ever put on a screen for a woman, and widely treated as unofficial, since it sat far outside her normal range.
• Sabine Lisicki — 131 mph (210.8 km/h), Stanford 2014. The mark the WTA recognizes.
• Venus Williams — 129 mph (207.6 km/h), 2007 US Open, the fastest at a major for years afterward.

Average tennis serve speed by level

Records are outliers. Here is roughly where serves actually land. These are ballpark ranges of the kind tour speed displays and coaching radar tend to show — not a formal study — and individuals vary widely inside every row.

Level	First serve	Second serve
ATP tour	115–125 mph	90–100 mph
WTA tour	95–105 mph	75–85 mph
NCAA D1 men	105–120 mph	80–95 mph
NCAA D1 women	90–100 mph	70–80 mph
Top junior boys (16–18)	95–110 mph	70–85 mph
Club 4.0 men	85–95 mph	60–70 mph
Club 4.0 women	70–80 mph	55–65 mph

The revealing column isn't the first serve, it's the second. A tour player drops roughly 25 mph between first and second and buys spin with the difference; a 4.0 drops the same 25 mph and buys nothing, which is why club matches turn on second-serve returns. Aces, holds and break points track that second number far more closely than the first.

If your Saturday group ends up testing serves, Tennis Scoreboard is a tennis scoreboard app for iPhone and Apple Watch that tracks match scores, so you can log the match while you argue about whose serve was quicker.

What the number on the stadium screen actually measures

Peak speed at racket contact — the fastest the ball ever travels, captured in the instant after impact and before drag has done anything to it. It is not the average over the flight, not the speed at the bounce, and not the speed the returner has to handle.

Measuring there is defensible, because it isolates what the server did rather than what the court did afterward. It also explains why the figure feels detached from what you see courtside.

Why a 130 mph serve arrives at about 70 mph

The ball loses speed twice: gradually in the air, then abruptly at the bounce.

Under ITF specification a standard ball weighs 56–59.4 g and measures 6.54–6.86 cm across. Light, and wrapped in felt — a high drag-to-mass ratio, so it bleeds speed the whole way. From a contact point around nine or ten feet up, a first serve covers roughly 60 feet to the bounce, then another 18-plus to a returner standing on or behind the baseline.

The bounce takes the bigger single bite. Friction and deformation scrub away much of the horizontal speed, and how much depends on what the ball is hitting: gritty clay grabs and slows it, slicker grass lets it skid through. Court surface alone shifts the arrival speed of an identical serve by several mph.

Add both losses and a flat first serve reaches the returner at roughly half its screen speed — a 130 mph serve lands in the racket at something like 65–75 mph. Elapsed time from contact to that moment is around half a second, which is why returners at every level commit to a side instead of reacting to the ball.

That doesn't make speed pointless. Compressing the opponent's decision time is the actual weapon, and it works. But placement, disguise and spin beat raw mph often enough that the biggest servers aren't automatically the best returners' problem. The rules governing the serve — two attempts, the let, the foot fault — are what set the trade-off between hitting it hard and hitting it in.

FAQ

What is the fastest tennis serve ever?

Sam Groth's 163.7 mph (263.4 km/h) at a Challenger in Busan in May 2012 is the highest figure ever recorded. It doesn't appear on ATP record pages because it wasn't struck at a tour-level event.

What is the fastest serve in women's tennis?

Sabine Lisicki's 131 mph (210.8 km/h) at Stanford in 2014 is the recognized WTA record. A higher reading — 220 km/h (136.7 mph) by Georgina García Pérez in Budapest in 2018 — is generally considered unofficial.

What is a good serve speed for a club player?

A solid 4.0 man usually serves in the high 80s to mid 90s mph on first serves and the 60s on seconds; a 4.0 woman, roughly 70–80 mph and mid-50s to mid-60s. At that level, consistency and placement move results more than mph does.

How fast is a 130 mph serve when it reaches the returner?

Around 65–75 mph. Air drag takes part of it and the bounce takes more, with the surface deciding how much.

Why do serve speeds differ between tournaments?

Venues use different measuring hardware, positioned and calibrated differently, and radar and camera-based tracking can disagree by a few mph on the same ball. So the average tennis serve speed reported at one event isn't strictly comparable to another's.