New York: World No. 2 Rafael Nadal advanced to the US Open third round by walkover on Thursday after Australian Thanasi Kokkinakis withdrew from the tournament with a right shoulder injury.

Sixth seed Alexander Zverev survived a second successive five-set marathon match at the US Open as he outlasted American Frances Tiafoe 6-3, 3-6, 6-2, 2-6, 6-3 on Thursday. Germany's Zverev was taken the distance by Radu Albot in his opening match and 45th-ranked Tiafoe forced him into another decider before last year's ATP Finals champion battled through to round three to equal his best US Open run.