Roger Federer confirmed he was suffering with a back problem during his US Open last-16 win against Philipp Kohlschreiber as he set up a quarter-final meeting with Juan Martin del Potro.Disturbing footage of G4S guards 'choking and mocking immigrant'
The world No. 3’s troublesome back has been a major talking point during the final Grand Slam of the year but Federer insisted the issue had been dealt with after his thumping win over Feliciano Lopez.
However, he was forced to take an off-court medical timeout against the German during a straight sets win.
After the match,… Read the full story