Roger Federer has pulled out of the upcoming hard-court tournaments in Toronto and Cincinnati because of lingering issues with his surgically repaired knee. The withdrawals announced Thursday shed doubt on his status for the U.S. Open, which begins on August 30. Federer turns 40 on Sunday and hasn’t competed since losing in the Wimbledon quarterfinals on July 8.
Federer pulls out of two tournaments, U.S. Open up in the air
