Argentine Juan Martín del Potro beat Austrian Jürgen Melzer 7-6 6-3 6-3 in the second leg of the US Open. He will face the Austrian Daniel Koellerer, who defeated Uruguayan Pablo Cuevas 3-6, 6-2, 6-1, 6-4.

Other results:

24-Juan Carlos Ferrero (Spain) beat Philipp Petzschner (Germany) 1-6 3-6 6-4 6-2 6-4 16-Marin Cilic (Croatia) beat Jesse Levine (U.S.) 4-6 2-6 6-0 6-3 6-0 Julien Benneteau (France) beat 30-Viktor Troicki (Serbia) 6-1 3-6 6-1 6-0 7-Jo-Wilfried Tsonga (France) beat Jarkko Nieminen (Finland) 7-5 6-3 6-4