Results: Janko Tipsarevic through as Tomas Berdych quits

Janko Tipsarevic is into the fourth round of the US Open after Tomas Berdych retired through injury during the second set of their match.

The Czech lost the first set 6-4 and was 5-0 down in the second before withdrawing.

The ninth seed had experienced a shoulder problem in the Open's warm-up event in Cincinnati last month, where he beat Roger Federer on the way to retiring in his semi-final against Novak Djokovic.

Tipsarevic now faces Juan Carlos Ferrero after the Spaniard's opponent, Marcel Granollers, withdrew from their match through injury.