Serve, breaks, aces and double faults: tennis in numbers
An ace is a serve the returner does not touch at all, a double fault is two missed serves in a row (a point to the opponent), and a break of serve is winning a game your opponent served. An ATP match averages 11.9 aces and a WTA match 5.4, but women hit more double faults than aces: 7.5 per match. Men hold serve in 76% of their service games and women in 63%, and on grass and indoors the serve gives an even bigger edge. We checked the serve stats of 21,648 ATP, WTA and Challenger matches over the last 12 months (October 2025 to September 2026). We show how often the usual ace and double-fault lines land and why the serve explains almost everything that happens to games and tie-breaks.
Key takeaways
- On grass men serve 13.1 aces per match on average, more than twice as many as on clay (6.3).
- Aces grow with match length (a 0.48 correlation with total games in men's matches), so an aces over is partly a bet on a long match.
- The easier it is to hold serve, the more tie-breaks there are: on grass 22% of men's sets end in one, on clay 14%.
- If a player retires, ace and double-fault bets are usually void unless the line has already been passed.
Holding serve and breaks of serve
Each game is served by one player. If they win it, they have held serve. If the opponent wins it, the opponent has broken serve. A break point is a point that gives the returner the break if they win it, for example at 30–40. More terms in our tennis glossary.
| Men, best of three | Women, best of three | Men, Grand Slams | |
|---|---|---|---|
| Matches with stats | 14,803 | 6,373 | 472 |
| Service games held | 75.5% | 63.3% | 80.0% |
| Break points per match | 13.3 | 16.9 | 18.9 |
| Break points converted | 41.1% | 46.1% | 38.6% |
| Breaks per match | 5.5 | 7.9 | – |
| First serves in | 62.3% | 66.7% | 63.2% |
| First-serve points won | 69.0% | 61.4% | 71.9% |
| Second-serve points won | 49.9% | 44.9% | 50.9% |
Women break serve in more than one return game in three, men in roughly one in four. On the ATP tour players hold in 79.7% of service games, in Challengers 74.3%, in the WTA 64.9% and in WTA 125 events 60.8%. That is why women's matches have more swings, fewer tie-breaks and more 6–0 sets. Yet the match result is just as predictable as in men's tennis, as we show in our article on favourites in tennis.
The surface changes the serve most
| Surface | Men: service games held | Men: aces per match | Women: service games held | Women: aces per match |
|---|---|---|---|---|
| Clay | 72.1% | 6.3 | 58.7% | 3.1 |
| Hard court | 76.9% | 10.2 | 65.3% | 5.3 |
| Indoor | 80.3% | 12.5 | 64.8% | 4.9 |
| Grass | 81.5% | 13.1 | 69.0% | 6.7 |
On grass men serve more than twice as many aces as on clay. Clay slows the ball down and makes it bounce higher, so the returner has more time. Hence more breaks and fewer tie-breaks on clay, and the opposite on grass. All the differences between surfaces are collected in our article on tennis surfaces.
Aces: how many there are and how often the lines land
| Aces line | Men: over | Aces line | Women: over | |
|---|---|---|---|---|
| 6.5 | 57.8% | 2.5 | 65.1% | |
| 8.5 | 44.1% | 3.5 | 51.9% | |
| 10.5 | 32.7% | 4.5 | 40.4% | |
| 12.5 | 24.2% | 5.5 | 31.1% | |
| 14.5 | 17.1% | 6.5 | 24.2% |
The median is 8 aces in a men's match and 4 in a women's match, in both cases best of three. Men's best-of-five matches average 20.2 aces.
The number of aces depends heavily on the length of the match: the correlation between aces and total games in men's matches is 0.48. A three-set match means more service games, so more chances for an ace. An aces over is therefore partly a bet on a long match, and an aces under with a clear favourite is largely a bet on a quick 2–0. How the gap in strength changes the number of games is shown in our article on total games and game handicaps.
Double faults: more common than aces in women's tennis
| Double faults line | Men: over | Women: over |
|---|---|---|
| 3.5 | 70.5% | 83.0% |
| 4.5 | 57.3% | 73.2% |
| 5.5 | 45.0% | 62.2% |
| 6.5 | 34.7% | 51.8% |
| 7.5 | 25.5% | 41.6% |
In 69% of women's matches there were more double faults than aces, in men's matches only in 31%. On average women hit 7.3 double faults per match and men 5.7. The surface affects double faults much less than aces: for women from 6.2 indoors to 7.8 on grass, for men from 5.0 to 6.0.
Betting on aces and double faults
- Not every bookmaker offers them. Ace and double-fault markets are not standard: when we checked offers at the end of September 2026, some bookmakers priced them for ATP matches, but we found none for a Challenger match. Some bookmakers also offer a market on the number of breaks of serve.
- How much a player serves depends on the player. Tour averages are only a starting point: a big server can hit twice as many aces as the average. We show each player's serve profile (aces per game, service games held, breaks) on the match page.
- Retirement. If a player retires, ace and double-fault bets are usually void unless the line has already been passed. More in our article on retirements in tennis.
- Data source. Bookmakers settle on the official match statistics, and different stats providers can differ by a single ace. With a result right on the line, that is enough.
Serve, tie-breaks and games
The serve explains most of what happens to games: the easier it is to hold, the more sets reach 6–6. That is why 22% of men's sets on grass end in a tie-break and 14% on clay. In our model the players' serve profiles clearly improve the tie-break and total games forecasts for men, but add almost nothing for women: there the serve decides less about who wins the game. Details in our article on tie-breaks.
Serve stats on SharkBetz
On our tennis tips the Profile column shows how each player wins points on serve and return compared with the tour. The match page has the full serve profile over the last 12 months: the number of matches in the sample, service games held, breaks, aces per game and tie-breaks. With a small sample we pull it towards the tour average so that a handful of matches cannot produce extreme numbers. For the full introduction, see tennis betting in numbers.
FAQ
How many aces are there in an average tennis match?
ATP matches average 11.9, Challengers 8.1, WTA matches 5.4 and WTA 125 matches 3.4. Men's best-of-five matches average 20.2. The figures come from the stats of 21,648 matches over the last 12 months.
Which surface produces the most aces?
Grass. Men serve 13.1 aces per best-of-three match there on average, 12.5 indoors, 10.2 on hard courts and 6.3 on clay. For women it ranges from 3.1 on clay to 6.7 on grass.
How often do tennis players hold serve?
Men win 75.5% of their service games and women 63.3%. On the ATP tour it is 79.7%, in Challengers 74.3%, in the WTA 64.9% and in WTA 125 events 60.8%. On grass men hold 81.5% of the time, on clay 72.1%.
Why are there so many double faults in women's tennis?
Women hit 7.3 double faults per match on average and men 5.7, while women serve only 4.6 aces on average. In 69% of women's matches there were more double faults than aces. On their second serve women win 45% of points, men 50%.
Does the length of the match affect ace betting?
Yes, strongly. The correlation between aces and total games in men's matches is 0.48. A longer match means more service games and more chances for an ace, so an aces over suits evenly matched contests.