Result: Novak Djokovic through to quarter-finals as Stanislas Wawrinka retires

Novak Djokovic
© PA Photos
Stanislas Wawrinka's retirement allows defending champion Novak Djokovic to advance through to the quarter-finals of the US Open.

World number two Novak Djokovic continued the defence of his US Open title with a walkover victory against Stanislas Wawrinka this afternoon.

The match got underway yesterday evening but was abandoned because of the wet conditions in New York with Djokovic leading the opening set 2-0.

When the pair returned to the Louis Armstrong Stadium this evening, Djokovic soon recorded another break of Wawrinka's serve to take command of the set.

His Swiss opponent managed to claim one of those breaks back, but it wasn't enough to prevent the defending champion from opening up a one-set lead.

The second set was dominated by Djokovic, who again broke Wawrinka twice on his way to wrapping up a 6-1 success.

Just before the third set got underway, Wawrinka called for a doctor and the trainer. Following a discussion, the Swiss player returned to the court.

However, with the score 3-1 in Djokovic's favour, Wawrinka decided that he could no longer continue because of a so-far-unspecified medical complaint.

As a result, Djokovic will now face either Juan Martin del Potro or Andy Roddick for a place in the semi-finals.

Tomas Berdych
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ATP RankingsPoints
1Scotland flag Andy Murray7,750
2Spain Rafael Nadal7,555
3Switzerland Roger Federer7,145
4Switzerland Stanislas Wawrinka5,780
5Serbia Novak Djokovic5,325
6Croatia Marin Cilic5,155
7Alexander Zverev4,470
8Austria Dominic Thiem4,030
9Japan Kei Nishikori3,285
10Canada Milos Raonic3,230
11Bulgaria Grigor Dimitrov3,070
12France Jo-Wilfried Tsonga2,770
13Belgium David Goffin2,560
14Spain Roberto Bautista Agut2,425
15Czech Republic Tomas Berdych2,390
16United States Jack Sock2,335
17Pablo Carreno Busta2,305
18Lucas Pouille2,220
19United States John Isner2,110
20United States Sam Querrey2,060