BEIJING, Oct. 1 (Xinhua) -- World No. 5 Petra Kvitova of the Czech Republic was upset by Spaniard Carla Suarez Navarro in the second round of the China Open WTA event while last year's runner-up Marin Cilic bowed out of ATP event opening round here on Monday.
Kvitova, last year's Wimbledon winner, never looked comfortable throughout the match against the 48th-ranked Navarro and just battled for one hour to lose at 6-3, 6-2.
The 22-year-old dropped serve five times in the straight sets loss and only scored 43 points, compared to 64 from her opponent.
Navarro's reward will be a third round clash against either former champion Jelena Jankovic of Serbia or Romanian Monica Niculescu.
Home favorite Zheng Jie, ranked 27th in the world, was also upset by a lower ranked player, Spaniard Lara Arruabarrena-Vecino.
The Spanish qualifier, who is currently the 88th in the world, lost two service games but broke Zheng four times to take the opening set at 6-2.
The second set was much closer and Zheng showed her battling qualities upon a noisy home crowd. However, Zheng had her comeback cut short and finally lost 6-4 to Arruabarrena-Vecino, 9 years her junior.
"I did not play against her before. Even we don't practice with each other. I can only view her through match video and her ranking is improving pretty fast this season," said Zheng. "For the main draw matches, every single player have the potential to win, no matter coming from the qualification matches or not."
On men's part, fourth seed Cilic won the first set but lost his momentum in the remaining match. "I would say just I wasn't serving consistently. When I had the break up in all three sets I would lose my serve, especially there in the third set," said Cilic, who lost the match at 3-6, 7-6, 6-4.