Defending champion and world number one Novak Djokovic retired from the round of 16-match against Stan Wawrinka in the ongoing US Open after he suffered pain in his left shoulder on Sunday evening.

US Open: Djokovic retires after shoulder injury, Wawrinka reaches quarter-finals

Federer, the reigning Australian Open champion, will face del Potro in the next round

Miami Master: Federer, Wawrinka register contrasting wins

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US Open: Djokovic retires after shoulder injury, Wawrinka reaches quarter-finals

Miami Master: Federer, Wawrinka register contrasting wins