Roger Federer's ferocious forehand is failing him.
So, too, are several other parts of his game. Collectively, they begin to answer the question of just what's been going wrong for the Swiss champion.
It is true. The 17-time Grand Slam winner is slowing down in more ways than one. He is no longer an enigma to figure out, but simply a player to out-play. As Ruhi Batra recently reported in The Times of India, he has become "just one of the boys."
As Federer's career winds down, it is time to take a look at what's been ailing him. Here are the top issues plaguing the man from Basel.