Tennis legend Roger Federer waves after Serbia’s Novak Djokovic beat Australia’s Alex de Minaur during a fourth round men’s singles match at the Wimbledon Tennis Championships in London, Monday, . (AP Photo/Kin Cheung) LONDON — Roger Federer was back at Wimbledon ,

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 is back at Wimbledon. The eight-time champion at the All England Club was sitting in the Royal Box to watch Monday’s fourth-round matches on Centre Court, starting with his