What if we told you there was a new rule that would’ve completely changed the outcome of the 2020 Australian Open? Fast4 (experimental rules including first-to-four-game sets and no-ad scoring) has the ability to make tennis even more exciting to watch, and has the ability to radically change the way the sport is played.

Do Sofia Kenin and Novak Djokovic keep their trophies? Or is there a secret champion waiting in the wings?

This is Replay: a series where we look at the way numbers have shaped the game we love.

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