Does Wimbledon final have a fifth set tie-break, or do players have to win by two clear games?
Wimbledon has reached the final with Novak Djokovic and Roger Federer battling it out.
And fans in London are set to witness another five-set epic.
But what happens if matches reach 6-6 in the final set and could the Wimbledon see another epic like Isner vs Anderson at Wimbledon last year?
Does Wimbledon have a fifth set tie-break?
Despite being thought of as the tournament most steeped in tradition, Wimbledon has decided to introduce a fifth set tie-break for men’s tennis.
But the system is a little bit different to other slams.
Players will play out the final set until one player is two games clear – all the way up to 12-12. A tie-break will then decide the winner.
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How do fifth sets work at other grand slams?
For the first time ever, each grand slam in 2019 has a different method of deciding a fifth set.
In the Australian Open, a tie-break is used after 6-6, but played to ten points.
The US Open has had a fifth set tie-break played under the regular format ever since 1970, while in the French Open players are still required to play out the set until there is a winner by two clear games.