Caroline Wozniacki has booked her place in the fourth round of the US Open following a straight-sets victory over Andrea Petkovic.
The Dane broke her opponent three times as she took the opening set 6-3 in under 40 minutes.
In the second set, Wozniacki broke early on to take a 3-0 lead, before holding on to win 6-2 against the German.
Wozniacki will now face the winner of Maria Sharapova and Sabine Lisicki's third-round tie.