Roger Federer hopes his former tennis rival Rafael Nadal can “retire on his own terms” after injuries which have prevented the Spaniard from competing in back-to-back Grand Slams. Nadal, 37, was forced to sit out of the French Open for the first time since 2004 — a tournament he has dominated for 18 years — as well as Wimbledon, a Grand Slam he’s won twice. Ad His long absence is due to a hip injury he suffered during the Australian Open and he has since struggled to make a return to competitive tennis because of ongoing issues and a lack of fitness.