US Open singles results

New York, Sep 1 (IANS) Following are the US Open singles results held here at the Flushing Meadows Friday:

Women's third round results: 19-Nadia Petrova bt 15-Lucie Safarova 6-4, 7-5; 3-Maria Sharapova bt Mallory Burdette 6-1, 6-1; 7-Samantha Stosur bt 31-Varvara Lepchenko 7-6(5), 6-2; Laura Robson bt Li Na 6-4, 6-7(5), 6-2; 5-Petra Kvitova bt Pauline Parmentier 6-4, 6-4; 11-Marion Bartoli bt Kristina Mladenovic 6-2, 6-4.

Men's second round results: Leonardo Mayer bt Tommy Robredo 6-1, 6-4, 4-6, 7-5; Lleyton Hewitt bt Gilles Muller 3-6, 7-6(5), 6-7(5), 7-5, 6-4; 14-Alexandr Dolgopolov bt Marcos Baghdatis 6-4, 3-6, 6-0, 7-6(5); 7-Juan Martin Del Potro bt Ryan Harrison 6-2, 6-3, 2-6, 6-2; 2-Novak Djokovic bt Dutra Silva 6-2, 6-1, 6-2; 4-David Ferrer bt Igor Sijsling 6-2, 6-3, 7-6(12); Richard Gasquet bt Bradley Klahn 6-3, 6-3, 6-1; Steve Johnson bt Ernests Gulbis 6-7(3), 7-6(5), 6-3, 6-4.