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.

The now-retired Federer sat in the Royal Box for his former rival Novak Djokovic's 1-6, 6-4, 6-4, 6-4 victory over Alex de Minaur in the fourth round at the All England Club.

Roger Federer had a front row seat to watch Novak Djokovic come back in his Round of 16 Wimbledon match vs. Alex de Minaur on Monday afternoon. Djokovic advances to his 16th Wimbledon quarterfinals with the win.