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Beijing - US Open champion Samantha Stosur was knocked out of the China Open on Tuesday in another upset at the tournament following shock defeats for the women's Wimbledon and French Open champions.
The Australian world number seven lost 7-5, 1-6, 7-5 in the second round to 2005 Beijing champion Maria Kirilenko, following early exits for French Open winner Li Na and Wimbledon champion Petra Kvitova.
Stosur was beaten in her opener last week in Tokyo as she played her first match since beating Serena Williams in last month's US Open final.
Kirilenko broke in the final game to claim the victory, with Stosur saving only one of six break points in a match lasting more than two hours.
Three other women's seeds advanced, with two-time Grand Slam finalist Vera Zvonareva, the third seed from Russia, putting out Czech Klara Zakopalova 6-3, 4-6, 6-2 and French number eight seed Marion Bartoli beating American Christina McHale 6-2, 6-1
Russian Anastasia Pavlyuchenkova, seeded 13, defeated Spain's Maria Martinez Sanchez 6-2, 6-3.
In the men's draw, top seed Jo-Wilfried Tsonga, who won the Metz title last month and is bidding to reach the eight-man ATP World Tour Finals, defeated Bulgarian Grigor Dimitrov 7-6 (7/5), 7-5.
Tsonga fired down nine aces and broke Dimitrov twice in their battle lasting just under two hours, beating the Bulgarian for the third time this season.
Russian Mikhail Youzhny, returning after a back injury, upset Spanish fourth seed Nicolas Almagro 6-3, 6-2 while China will have a player in the second round after Zhang Ze beat Li Zhe 6-1, 6-3.
Results on the fourth day of the China Open on Tuesday (x denotes seeding):
Men
First Round
Mikhail Youzhny (RUS) bt Nicolas Almagro (ESP x4) 6-3, 6-2
Albert Montanes (ESP) bt Paul Capdeville (CHI) 6-3, 6-3
Zhang Ze (CHN) bt Li Zhe (CHN) 6-1, 6-3
Philipp Kohlschreiber (GER) bt Tommy Robredo (ESP) 6-3, 7-6 (7/0)
Jo-Wilfried Tsonga (FRA x1) bt Grigor Dimitrov (BUL) 7-6 (7/5), 7-5
Fabio Fognini (ITA) bt Grega Zemlja (SLO) 6-4, 6-1
Tomas Berdych (CZE x3) bt Jurgen Melzer (AUT) 7-5, 7-5
Marcel Granollers (ESP) bt Gilles Simon (FRA x5) 6-3, 6-1
Ivan Ljubicic (CRO) bt Teymuraz Gabashvili (RUS) 7-5, 7-5
Women
Second Round
Vera Zvonareva (RUS x3) bt Klara Zakopalova (CZE) 6-3, 4-6, 6-2
Anastasia Pavlyuchenkova (RUS x13) bt Maria-José Martinez Sanchez (ESP) 6-2, 6-3
Flavia Pennetta (ITA) bt Daniela Hantuchova (SVK) 6-2, 6-1
Marion Bartoli (FRA x8) bt Christina McHale (USA) 6-2, 6-1
Maria Kirilenko (RUS) bt Samantha Stosur (AUS x6) 7-5, 1-6, 7-5
Virginie Razzano (FRA) bt Roberta Vinci (ITA x15) 7-6 (9/7), 6-0
Andrea Petkovic (GER x9) bt Carla Suarez Navarro (ESP) 6-4, 6-4
Caroline Wozniacki (DEN x1) bt Jarmila Gajdosova (AUS) 6-2, 6-3
