Roger Federer felt a tightening muscles on his left leg during his fourth round match against Philipp Kohlschreiber. Leading 6-4 6-2, Federer asked for a medical time-out and after a few minutes with his trainer, he got back on the court and finished off the third set with a 7-5 win on Monday night.  In his post match interview, when asked about the medical time-out, he said,  “It was just a precaution, i’m fine now, i’m not worried about it.” Roger Federer faces Juan Martin del Potro in the quarter finals.

In other results, Rafael Nadal beat Alexandr Dolgopolov 6-2 6-4 6-1, Juan Martin Del Porto beat Dominic Thiem 1-6 2-6 6-1 7-6  6-4.

In the women’s singles, Madison Keys beat Elina Svitolina 7-6 1-6 6-4, Coco Vandeweghe beat Lucie Safarova  6-4 7-6 and Karolina Pliskova beat Jennifer Brady 6-1 6-0