Wawrinka advances as Tursunov retires with injury

Wawrinka was leading 7-6(2) 6-3 when Tursunov, who had called the trainer midway through the second set to treat an apparent hip problem, indicated to the umpire he was unable to continue any further.

Tursunov, playing his first grand slam main draw match since the 2014 US Open after battling a succession of foot injuries, had an opportunity to snatch the first set before the Swiss forced a tiebreak, that he won easily 7-2.

The 2014 Melbourne Park champion then pulled away to a 3-0 lead in the second set before Tursunov sought treatment on his painful hip and when the fourth-seeded Wawrinka sealed the second set, the Russian retired.