US Open results

Following are the US Open results on Thursday, the fourth day of the 2015 tournament at Flushing Meadows (prefix number denotes seeding):

Men

Second round

5-Stan Wawrinka, Switzerland, bt Hyeon Chung, South Korea, 7-6 (7-2), 7-6 (7-4), 7-6 (8-6)

Ruben Bemelmans, Belgium, bt 28-Jack Sock, United States, 4-6, 4-6, 6-3, 2-1 - retired

22-Viktor Troicki, Serbia, bt Rajeev Ram, United States, 7-6 (12-10), 6-4, 3-6, 6-3

Donald Young, United States, bt Aljaz Bedene, Britain, 3-6, 6-4, 6-4, 6-2

15-Kevin Anderson, South Africa, bt Austin Krajicek, United States, 6-3, 6-4, 6-2

20-Dominic Thiem, Austria, bt Denis Istomin, Uzbekistan, 6-4, 6-4, 1-0 - retired

30-Thomaz Bellucci, Brazil, bt Yoshihito Nishioka, Japan, 6-0, 6-3, 6-4

3-Andy Murray, Britain, bt Adrian Mannarino, France, 5-7, 4-6, 6-1, 6-3, 6-1

6-Tomas Berdych, Czech Republic, bt Jurgen Melzer, Austria, 7-6 (7-2), 6-1, 6-3

31-Guillermo Garcma-Lspez, Spain, bt Nicolas Mahut, France, 6-4, 6-2, 6-7 (4-7), 6-1

24-Bernard Tomic, Australia, bt Lleyton Hewitt, Australia, 6-3, 6-2, 3-6, 5-7, 7-5

12-Richard Gasquet, France, bt Robin Haase, Netherlands, 4-6, 6-3, 7-6 (7-4), 6-4

13-John Isner, United States, bt Mikhail Youzhny, Russia, 6-3, 6-4, 6-4

Jirm Vesel, Czech Republic, bt 21-Ivo Karlovic, Croatia, 7-6 (7-3), 3-6, 3-6, 6-2, 7-6 (7-4)

29-Philipp Kohlschreiber, Germany, bt Lukas Rosol, Czech Republic, 7-6 (7-4), 6-2, 6-2

2-Roger Federer, Switzerland, bt Steve Darcis, Belgium, 6-1, 6-2, 6-1

Women

Second round

5-Petra Kvitova, Czech Republic, bt Nicole Gibbs, United States, 6-3, 6-4

30-Anna Karolina Schmiedlova, Slovakia, bt Danka Kovinic, Montenegro, 6-4, 5-7, 6-4

18-Andrea Petkovic, Germany, bt Elena Vesnina, Russia, 6-3, 7-6 (7-4)

Johanna Konta, Britain, bt Garbiqe Muguruza, Spain, 7-6 (7-4), 6-7 (4-7), 6-2

16-Sara Errani, Italy, bt Jelena Ostapenko, Latvia, 0-6, 6-4, 6-3

22-Samantha Stosur, Australia, bt Evgeniya Rodina, Russia, 6-1, 6-1

26-Flavia Pennetta, Italy, bt Monica Niculescu, Romania, 6-1, 6-4

Varvara Lepchenko, United States, bt Lesya Tsurenko, Ukraine, 7-6 (9-7), 6-2

Mona Barthel, Germany, bt Olga Govortsova, Belarus, 2-6, 6-2, 6-4

20-Victoria Azarenka, Belarus, bt Yanina Wickmayer, Belgium, 7-5, 6-4

11-Angelique Kerber, Germany, bt Karin Knapp, Italy, 7-5, 6-2

Barbora Strycova, Czech Republic, bt Qiang Wang, China, 6-2, 4-6, 7-5

24-Sabine Lisicki, Germany, bt Camila Giorgi, Italy, 6-4, 6-0

Shelby Rogers, United States, bt Kurumi Nara, Japan, 6-4, 6-4

2-Simona Halep, Romania, bt Kateryna Bondarenko, Ukraine, 6-3, 6-4

Endi