Roger Federer Predicts Winner of Novak Djokovic vs. Jannik Sinner Wimbledon Match originally appeared on Athlon Sports.

After taking what Novak Djokovic called "a nasty fall" Wednesday in the final moments of a Wimbledon quarterfinal victory over No. 22 seed Flavio Cobolli, the 38-year-old Serbian star canceled his afternoon practice session Thursday.

Roger Federer has made a return to Wimbledon — but to watch, not play, tennis. The eight-time champion at the All England Club sat in the Royal Box during his former rival Novak Djokovic's four-set victory over Alex de Minaur in the fourth round Monday.