After surviving a tough match against Alex De Minaur in the fourth round at Wimbledon, Novak Djokovic had a funny reason why Monday's win meant more to him.

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.

Things looked shaky early, but Novak Djokovic eventually found his form in a fourth-round win over Alex de Minaur at Wimbledon on Monday. After dropping the first game 6-1, Djokovic rallied to win the next three sets 6-4,