Roger Federer is undoubtedly the greatest tennis player in history and his record 16 Grand Slam titles are unlikely to be equalled.
But the Swiss star is fading. He has failed to reach the final of the last three Grand Slams and at 29 he is entering late middle age in tennis terms.
On Saturday he lost at Flushing Meadows to Novak Djokovic, a man he has demolished in straight sets in their previous three US Open meetings.
Federer is determined to battle on, but should he?
His best days are clearly behind him and if he continues, is he in danger of tarnishing his golden legacy?
Share your thoughts...