After decades of dominance, Roger Federer, Andy Murray, and now Rafael Nadal have hung up their rackets and entered retirement. Novak Djokovic is the only active player from the quartet. That's why when all four legends are spotted in one place, at a Grand Slam no less, it's a momentous occasion.

Novak Djokovic battled from a set down to clinch his 100th tour-level title by beating Polish sixth seed Hubert Hurkacz 5-7 7-6(2) 7-6(2) at the Geneva Open on Saturday. The Serbian, who turned 38 on Thursday,