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DOHA, Qatar -- Australian Open champion Li Na was upset by Czech qualifier Petra Cetkovska 7-6 (2), 2-6, 6-4 in the Qatar Open third round on Thursday. "She played well. I dont think I was playing so bad," Li said. "Maybe, sometimes the wrong choice made me lose a lot of important points." It was the top-seeded Lis first loss of the year having won her two previous tournaments: Shenzhen and the Australian Open. Regardless of her early defeat in Doha, Li will move up to a career-best No. 2 in the WTA rankings on Monday, overtaking Victoria Azarenka, who was not defending her Doha title because of a foot injury. Second-seeded Agnieszka Radwanska of Poland was leading 6-4, 0-1 when her opponent, qualifier Mirjana Lucic-Baroni of Croatia, retired with a lower back injury. Third-seeded Petra Kvitova was stretched to three sets before closing the door 7-6 (2), 5-7, 6-2 on fellow Czech Lucie Safarova. The left-handed Kvitova served 15 aces and took advantage of four of five break-point opportunities in the two-hour, 25-minute match. "I served well, yes," said Kvitova, the 2011 Wimbledon champion. "I had one window when I did some double-faults, unfortunately. But with the aces Im really glad." In Fridays quarterfinals, Cetkovska plays Angelique Kerber, Radwanska takes on Yanina Wickmayer, Kvitova faces fifth-seeded Jelena Jankovic, and fourth-seeded Sara Errani faces seventh-seeded Simona Halep. Li, playing her first tournament since winning the Australian Open, had a 3-1 lead in the third set, but the 133rd-ranked Cetkovska refused to fold. "Its an amazing victory," Cetkovska said. "Its a little bit difficult to describe exactly what I feel at the moment. "Even though I was 3-1 down in the third set I could manage to make it and get through." Despite breaking Cetkovskas serve on six of 12 opportunities, and surrendering only three of her own service games in 11 break points faced, Li played tentative tennis throughout the two-hour, 46-minute match. "It was cold. Its windy," said Li, noting the inhospitable weather greeting tennis players in Doha this week. "The court is a little slower. When I think I can hit a winner the opponent always gets the ball back, so I always have to be ready for the next shot." This marks the eighth time Cetkovska has beaten a top-10 player. Its only the second time shes beaten a top-three ranked player -- she upset the then third-ranked Agnieszka Radwanska at the 2011 Rome tournament. Errani defeated Monica Niculescu of Romania 2-6, 7-5, 6-1, Jankovic defeated wild card Alisa Kleybanova of Russia 6-1, 6-2, and Kerber sent Klara Zakopalova of Czech Republic packing 6-2, 6-3. Dorance Armstrong Jr. Cowboys Jersey .com) - Novak Djokovic easily took care of Andy Murray to reach the final at the $2. Connor Williams Cowboys Jersey . With the results, North America claimed 2.5 of the three available points, opening up a 17.5-12.5 lead in the overall standings. A total of 60 points are available, meaning the first team to 30.5 points will win the Continental Cup. http://www.thecowboysfansmall.com/c-96-cowboys-michael-gallup-jersey.aspx . Bring on Freddy Garcia. The well-travelled 36-year-old right-hander earned his second NL victory since 2007, and his first since he joined the Atlanta Braves last month, pitching six innings to help beat Miami 6-1 Thursday. Chidobe Awuzie Jersey . -- Challenged for the first time under Major League Baseballs expanded replay system, umpires got it right. Terrell Owens Cowboys Jersey . The Blue Jackets play Thursday night at New Jersey in their first game after the NHLs Olympic hiatus. A native of Trencin, Slovakia, Gaborik has represented his country at the 2006 and 2010 Olympics but was unable to play in Sochi because of his injury. With the World Cup opening match now just over a week away, TSNs soccer insiders weigh in with their predictions and a breakdown of eacch group in the latest edition of the TSN FC podcast.dddddddddddd TSN FC podcast: WC group breakdowns, predictions Cheap Warriors Jerseys Authentic Cavaliers Jerseys Cheap Spurs Store Celtics Jerseys Online Cheap Bulls Jerseys Cheap Nets Jerseys Cheap Thunder Jerseys Cheap 76ers Jerseys Cheap Knicks Jerseys Wholesale Raptors Jerseys Cyber Monday Pistons Jerseys Wholesale Team USA Basketball Jerseys Cheap Celtics Jerseys Cheap Nets Jerseys Cheap Knicks Jerseys Cheap 76ers Jerseys Raptors Jerseys From China Cheap Bulls Jerseys Cavaliers Jerseys From China Wholesale Pistons Jerseys Bucks Jerseys From China Pacers Jerseys Outlet Authentic Hawks Jerseys Cheap Hornets Jerseys Cheap Heat Jerseys Cheap Magic Jerseys Authentic Wizards Jerseys Cheap Nuggets Jerseys Timberwolves Jerseys Outlet Wholesale Thunder Jerseys Cheap Blazers Jerseys Cheap Jazz Jerseys Discount Warriors Jerseys Wholesale Clippers Jerseys Wholesale Lakers Jerseys Cheap Suns Jerseys Cheap Kings Jerseys Discount Mavericks Jerseys Authentic Rockets Jerseys Discount Grizzlies Jerseys Cheap Pelicans Jerseys Spurs Jerseys From China ' ' '