A Grand Slam semifinal is one win from the final, but the match format depends on the singles draw. Men’s singles semifinals are best of five sets, while women’s singles semifinals are best of three. That difference can shape everything from a player’s tactics to how long the match lasts.
All four majors—the Australian Open, French Open, Wimbledon and US Open—use the same basic singles scoring rules. Here’s how the semifinal format works, including what happens at 6–6 and why a men’s semifinal can become a test of endurance.
How many sets are played in a Grand Slam semifinal?
In men’s singles, the first player to win three sets wins the match. A semifinal can therefore last three, four or five sets. In women’s singles, the first player to win two sets advances, so the match lasts two or three sets.
| Grand Slam singles event | Semifinal format | Sets needed to win |
|---|---|---|
| Men’s singles | Best of five sets | 3 |
| Women’s singles | Best of three sets | 2 |
“Best of five” does not mean a player must win five sets. It means the match ends as soon as one player has won three. A straight-sets win is 3–0. If the players split the first four sets, the fifth decides who reaches the final.
Likewise, a best-of-three match can finish in two sets or go to a deciding third set. The winner does not need to win every set—only more sets than the opponent under the format.
How does the tiebreak work?
At 6–6 in a set, the players play a tiebreak. In a standard tiebreak, the first player to reach seven points with a lead of at least two wins the set. If the score reaches 6–6 in the deciding set, all four Grand Slams use a longer tiebreak: the first to 10 points, again with a two-point margin.
That final-set rule was brought in across the majors in 2022. Before the change, the tournaments had different deciding-set rules, and some matches could continue for a very long time. The 2018 Wimbledon semifinal between Kevin Anderson and John Isner lasted 6 hours and 36 minutes and ended 26–24 in the fifth set. Under today’s rule, a deciding set tied at 6–6 would move to a 10-point tiebreak instead.
The tiebreak does not change the number of sets required to win. It simply provides a defined way to finish a set that reaches 6–6.
Why the men’s semifinal can be a different physical test
A best-of-five match gives players more time to recover from a poor start. A man can lose the first two sets and still win the match by taking the next three. That makes patience important: players may adjust their return position, target a weaker wing, or change how often they come to the net as the match develops.
It also places a bigger demand on fitness and recovery. A five-set semifinal can leave a player with less energy for the final, especially if it includes long rallies or a deciding-set tiebreak. Serving well matters, but so does conserving effort: a player who tries to hit a winner on every short ball may pay for it late in the match.
Women’s singles semifinals are best of three, just like women’s singles matches in the earlier rounds. There is less room to recover from a slow start, since dropping the first set leaves no more than two sets to turn things around. The match can still be physically demanding, but it cannot extend to four or five sets.
Who plays in the semifinal?
The semifinal is the last round before the championship match. The four players who remain in the singles draw are paired into two semifinals. Each winner advances to the final; each loser is eliminated. The tournament draw determines who faces whom, rather than a separate ranking or scoring rule for semifinals.
Players usually reach this stage by winning earlier rounds, but their routes can be very different. One may have won several close matches, while the other has spent less time on court. That contrast can matter: fatigue, injuries and the time available to recover all become part of the contest as the tournament nears its end.
Does this format apply to every Grand Slam event?
No. The best-of-five rule is for men’s singles at the majors, and the best-of-three rule is for women’s singles. Doubles, mixed doubles, junior events and wheelchair events have their own formats, which can differ in the number of sets or use of a match tiebreak. If you are watching an event other than singles, check that event’s rules rather than assuming the singles format applies.
Scheduling also varies. Tournament organizers decide when the semifinal matches take place and how much rest players have before the final. The match format tells you how many sets may be needed; it does not guarantee a particular start time or recovery period.
Frequently Asked Questions
Are men’s Grand Slam semifinals best of five?
Yes. In men’s singles, a player must win three sets to reach the final. The match can last three, four or five sets.
Are women’s Grand Slam semifinals best of three?
Yes. In women’s singles, a player must win two sets. The match ends in two sets or goes to a deciding third set.
What happens at 6–6 in the final set?
The players play a 10-point tiebreak. The first to reach 10 points with a two-point lead wins the set and the match.
Can a Grand Slam semifinal finish in straight sets?
Yes. A men’s singles semifinal can finish 3–0, and a women’s singles semifinal can finish 2–0.
Final Thoughts
The key point is simple: Grand Slam men’s singles semifinals are best of five, while women’s singles semifinals are best of three. Tiebreaks settle sets tied at 6–6, with a 10-point tiebreak used in the deciding set. Knowing those rules makes it easier to follow the score—and to understand why some semifinals turn into a quick two-set win while others become a long battle for a place in the final.
