How Tennis Tiebreaks Actually Work — and Why the Rules Differ by Tournament
A guide to tennis tiebreak scoring, the sport's long resistance to it, and why all four Grand Slams only agreed on identical final-set rules in 2022.
Photo: Jim · CC BY-SA 2.0 · source
A tiebreak decides a set once the games reach a deadlock, but the exact point at which it kicks in — and how many points it takes to win it — has varied so much between tournaments that even regular viewers get caught out. It took tennis more than 50 years to get all four Grand Slams playing the deciding set the same way.
The basic mechanics
A standard tiebreak is played once a set reaches six games apiece. Instead of continuing until someone leads by two games, players contest a separate mini-game: the first to seven points, winning by at least two, takes the set. Serve rotates after the first point and then every two points, and players switch ends every six points. If the score reaches 6-6 inside the tiebreak itself, play continues until someone establishes that two-point cushion — which is why some tiebreaks stretch into the twenties.
This format applies to every non-deciding set at nearly all levels of the sport. The complication has always been the final set — the third set in a best-of-three match, or the fifth in a best-of-five.
Why the deciding set was different for so long
For decades, major tournaments simply let the last set run on advantage scoring with no tiebreak at all, on the logic that a Grand Slam final shouldn’t be settled by a shootout. That produced some historic marathons — most famously the 2010 Wimbledon match between John Isner and Nicolas Mahut, whose final set alone ran 70-68 over three days, as recounted by outlets covering the Djokovic-Federer 2019 Wimbledon final, itself decided by a historic tiebreak.
The push for change came a few years later, after the 2018 Wimbledon men’s semifinal between Kevin Anderson and John Isner, decided 26-24 in a fifth set that ran more than six and a half hours. In October 2018, Wimbledon announced that, starting the following year, it would introduce a tiebreak in the final set once the score reached 12-12 in games — giving players a long runway to finish it on serve, but capping the match length. The tournament said the decision was informed by two decades of match data and consultation with players and officials, according to the official announcement. That tiebreak was played first to seven points, and the 2019 men’s final between Novak Djokovic and Roger Federer — decided in a 12-12 tiebreak — became the first Wimbledon final settled under the new rule.
Other majors had already moved in different directions. The Australian Open had adopted a 10-point tiebreak at 6-6 in the deciding set. The US Open had used a 7-point tiebreak at 6-6 since the 1970s. The French Open, true to its slower, clay-court traditions, had no deciding-set tiebreak at all — matches there could still run indefinitely.
The 2022 standardisation
That patchwork ended in March 2022, when all four majors agreed to adopt the same rule: at 6-6 in the final set, players now contest a 10-point tiebreak, won by whoever reaches 10 points with a two-point advantage, as confirmed by Tennis.com’s rundown of the change. Wimbledon shifted its trigger point back from 12-12 to 6-6 and lengthened the tiebreak from 7 to 10 points; the French Open introduced a deciding-set tiebreak for the first time in its history. It was framed initially as a trial, to be reviewed after a full Grand Slam season, though it has remained in place at all four events since.
Where the tiebreak came from
The idea itself predates any of this by decades. It was invented by Jimmy Van Alen, a Rhode Island tennis enthusiast, after he sat through an excessively long singles final that delayed the day’s scheduled doubles match. His original 1954 concept was a nine-point sudden-death shootout, part of a wider alternative scoring system that the sport’s governing bodies initially rejected. The tiebreak finally made its Grand Slam debut at the 1970 US Open, which the New York Times at the time called “the most revolutionary step the sport has ever taken in its scoring system,” according to the US Open’s own retrospective. Players disliked how a match could hinge on so few points, and by 1975 the US Open had switched to the 12-point version that, in modified form, is now used worldwide.
Why it still causes confusion
Because the rule changed tournament by tournament and then changed again in 2022, older articles, forum threads and even some broadcasters still describe outdated versions — Wimbledon’s 12-12 trigger, or the French Open’s lack of any tiebreak. Junior, college and recreational tennis also frequently use their own variations, including “match tiebreaks” played instead of a full third set. None of that is wrong, exactly — it just reflects a sport that only recently agreed on one answer to a question it had answered five different ways.
The takeaway
At all four Grand Slams today, a set is decided by a standard 7-point tiebreak at 6-6, except the final set, which now goes to a 10-point tiebreak, also starting at 6-6. Outside the majors — in juniors, college tennis and many local leagues — always check the specific event’s rules before assuming those numbers apply.
Tennis is one of several sports that redesigned its clock and scoring for the modern audience — see also how MLB’s pitch clock works and what it changed and the 24-second shot clock that rescued the NBA.