US Open 2017: Roger Federer beats Germany's Philipp Kohlschreiber, reaches quarter final
The Swiss seed outplayed his German opponent 6-4 6-2 7-5.
Federer will take on Juan Martin del Potro in the quarter finals.
Potro defeated sixth seed Dominic Thiem 1-6 2-6 6-1 7-6 (7-1) 6-4 to reach the quarter-finals stage of the tournament.
After the win, Federer was quoted by BBC: "I just needed a bit of a rub on my back. Or my… bottom."
"I just felt something, sort of my muscle being tight at the back. Sort of my quad, I guess" he added.
Image: Twitter handle of US Open Tennis.
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