Janko Tipsarevic rallies to beat Philipp Petzschner

Serbian seventh seed Janko Tipsarevic had to come from a set down to beat Germany's Philipp Petzschner in the second round of the men's Olympic singles at Wimbledon.

World number 91 Petzschner only needed one break of serve as he won the opening set 6-3.

It was a similar story in the second, but this time it was Tipsarevic who claimed it 6-3 to level the contest.

The Serbian, who will face American 10th seed John Isner for a quarter-final berth, took the deciding set 6-4.