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New York - Danish fourth seed Caroline Wozniacki was ousted from the US Open on Thursday by 149th-ranked Czech Petra Cetkovska, leaving only three of the top-10 women in the event.
Cetkovska outlasted Wozniacki 6-4, 5-7, 7-6 (7/1) in a night match at Arthur Ashe Stadium to book a third-round match against Italian 26th seed Flavia Pennetta.
With the departure of former world number one Wozniacki, the US Open runner-up in 2009 and last year, the only top-10 seeds remaining in the year's final Grand Slam tournament from the original draw are top-ranked Serena Williams, Romanian second seed Simona Halep and Czech fifth seed Petra Kvitova.
US Open results on Thursday, the fourth day of the 2015 tournament at Flushing Meadows (x denotes seeded player):
Men
2nd rd
Stan Wawrinka (SUI x5) bt Hyeon Chung (KOR) 7-6 (7/2), 7-6 (7/4), 7-6 (8/6)
Ruben Bemelmans (BEL) bt Jack Sock (USA x28) 4-6, 4-6, 6-3, 2-1 - retired
Viktor Troicki (SRB x22) bt Rajeev Ram (USA) 7-6 (12/10), 6-4, 3-6, 6-3
Donald Young (USA) bt Aljaz Bedene (GBR) 3-6, 6-4, 6-4, 6-2
Kevin Anderson (RSA x15) bt Austin Krajicek (USA) 6-3, 6-4, 6-2
Dominic Thiem (AUT x20) bt Denis Istomin (UZB) 6-4, 6-4, 1-0 - retired
Thomaz Bellucci (BRA x30) bt Yoshihito Nishioka (JPN) 6-0, 6-3, 6-4
Andy Murray (GBR x3) bt Adrian Mannarino (FRA) 5-7, 4-6, 6-1, 6-3, 6-1
Tomas Berdych (CZE x6) bt Jurgen Melzer (AUT) 7-6 (7/2), 6-1, 6-3
Guillermo Garca-Lpez (ESP x31) bt Nicolas Mahut (FRA) 6-4, 6-2, 6-7 (4/7), 6-1
Bernard Tomic (AUS x24) bt Lleyton Hewitt (AUS) 6-3, 6-2, 3-6, 5-7, 7-5
Richard Gasquet (FRA x12) bt Robin Haase (NED) 4-6, 6-3, 7-6 (7/4), 6-4
John Isner (USA x13) bt Mikhail Youzhny (RUS) 6-3, 6-4, 6-4
Jir Vesel (CZE) bt Ivo Karlovic (CRO x21) 7-6 (7/3), 3-6, 3-6, 6-2, 7-6 (7/4)
Philipp Kohlschreiber (GER x29) bt Luks Rosol (CZE) 7-6 (7/4), 6-2, 6-2
Roger Federer (SUI x2) bt Steve Darcis (BEL) 6-1, 6-2, 6-1
Women
2nd rd
Petra Kvitova (CZE x5) bt Nicole Gibbs (USA) 6-3, 6-4
Anna Karolina Schmiedlova (SVK x30) bt Danka Kovinic (MNE) 6-4, 5-7, 6-4
Andrea Petkovic (GER x18) bt Elena Vesnina (RUS) 6-3, 7-6 (7/4)
Johanna Konta (GBR) bt Garbie Muguruza (ESP x9) 7-6 (7/4), 6-7 (4/7), 6-2
Sara Errani (ITA x16) bt Jelena Ostapenko (LAT) 0-6, 6-4, 6-3
Samantha Stosur (AUS x22) bt Evgeniya Rodina (RUS) 6-1, 6-1
Flavia Pennetta (ITA x26) bt Monica Niculescu (ROM) 6-1, 6-4
Petra Cetkovska (CZE) bt Caroline Wozniacki (DEN x4) 6-4, 5-7, 7-6 (7/1)
Varvara Lepchenko (USA) bt Lesya Tsurenko (UKR) 7-6 (9/7), 6-2
Mona Barthel (GER) bt Olga Govortsova (BLR) 2-6, 6-2, 6-4
Victoria Azarenka (BLR x20) bt Yanina Wickmayer (BEL) 7-5, 6-4
Angelique Kerber (GER x11) bt Karin Knapp (ITA) 7-5, 6-2
Barbora Strycova (CZE) bt Qiang Wang (CHN) 6-2, 4-6, 7-5
Sabine Lisicki (GER x24) bt Camila Giorgi (ITA) 6-4, 6-0
Shelby Rogers (USA) bt Kurumi Nara (JPN) 6-4, 6-4
Simona Halep (ROM x2) bt Kateryna Bondarenko (UKR) 6-3, 6-4
