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. 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Left-handed reliever Boone Logan agreed to a $16.5 million, three-year contract on Friday, a person familiar with the negotiations told The Associated Press.BUFFALO, N.Y. -- Former Sabres owner Tom Golisano has met with Buffalo Bills officials and public leaders, and informed them of his interest in purchasing the NFL franchise, said people involved with the negotiations. One person said Wednesday that Golisano also has had talks with developer Scott Congel to be his partner in the potential ownership group. The person added that their discussions have included the proposal of building a new stadium in West Seneca, about a 10-minute drive from the Bills current home, Ralph Wilson Stadium. The people spoke to The Associated Press on the condition of anonymity because Golisano has not publicly announced his plans. The land where the proposed stadium would be built belongs to Pyramid Management Group, which is owned by Robert Congel, Scotts father. The Syracuse-based company is one of the largest shopping mall developers in the northeast. A person at Golisanos office told the AP Wednesday that he has no comment regarding the Bills. Golisano also failed to return a message left on his cellphone. Congel declined to comment about a potential partnership with Golisano in an interview with The Buffalo News published on the newspapers website Wednesday evening. Congel did confirm he has made plans to redevelop the Shops at West Seneca land, which would include the potential of building a 60,000-plus seat stadium. The Bills are on the market after the teams Hall of Fame owner and founder, Ralph Wilson, died in March. Wilsons estate hired an attorneys and an investment banking firm last week to oversee the sale. They are expected to begin contacting prospective ownership groups by the end of next month. A new owner could be identified by as early as the end of July. The new owner would require approval from 24 of the NFLs 31 owners. New York City real estate mogul Donald Trump has already announced his interest in buying the team. Bills Hall of Fame quarterback Jim Kelly has also said he has had talks to partner with numerous ownership groups. Golisanos entry into the bidding process does not come as a surprise. He first discusseed the possibility of buying the Bills not long after purchasing the Sabres out of bankruptcy in 2004.dddddddddddd Golisano said he would especially become involved in an ownership group if there were any fears of the team relocating. Wilsons death has raised concerns about the franchises long-term future because of the possibility the team could be sold and eventually relocated to a more prosperous market such as Toronto. Golisano sold the Sabres in 2011. Later that year, he became involved in a group that failed in a bid to purchase the Major League Baseball Los Angeles Dodgers. The 72-year-old Golisano made his fortune founding Rochester-based Paychex, a payroll processing firm. His net worth was most recently estimated by Forbes to be at about $2 billion. Hes from Rochester, but now makes his home in Florida. He came to prominence in New York in the late 1990s, when he made three unsuccessful gubernatorial runs. Congel was previously a principal at Pyramid. He has most recently run into difficulties attempting to redevelop the Medley Centre mall outside of Rochester. The mall is now vacant. Earlier this month, The Rochester Democrat and Chronicle reported that Monroe County officials voted to declare that Congel was in default of his tax deal by failing to invest at least $165 million to redevelop the property. Pyramids holdings, by comparison, have been lucrative with the company estimated to bring in estimated $5 billion in annual revenue from its 17 properties. The land the Shops at West Seneca are located upon are partially undeveloped and on the site of a former mall. NFL Commissioner Roger Goodell has said a new stadium would be the next step in securing the teams long-term future. New York state has also hired an architectural and design firm to identify between three or four sites across the region that could serve as the teams new home. The Bills are essentially locked into playing at Ralph Wilson Stadium through the end of the 2019 season under the terms of the lease the franchise reached with the state and county in December 2012. ' ' '