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.

The win marked the 16th time Djokovic has moved into the quarterfinals at Wimbledon. The event has been his second-best Grand Slam over his career. Djokovic has seven wins at Wimbledon, and has played in the final at the event in each of the last six Wimbledons.

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.