ISTANBUL, Turkey -- Top-ranked Serena Williams advanced to the semifinals of the WTA Championships by sweeping past Petra Kvitova 6-2, 6-3 on Thursday. Richard Sherman Jersey . Williams, the defending champion, won all three matches in her group without dropping a set. Shes bidding for her fourth title in the elite, eight-women tournament. Earlier, Li Na outlasted Jelena Jankovic 6-3, 2-6, 6-3 for her second victory in two matches and eight-seeded Angelique Kerber upset No. 3 Agnieszka Radwanska 6-2, 6-2 to remain in contention for the semifinals. Radwanska was eliminated. Kerber went 0-3 last year in the tournament and this was her first win in the event. She will play Kvitova on Friday for a slot in the last four. Williams needed to win only a set to qualify and she breezed through the first despite fighting off three break points in the very first game. She quickly warmed up to overwhelm the fifth-seeded Kvitova, who won Wimbledon and the WTA title in 2011. Kvitova had to withdraw last year because of injury. "Something told me to hold serve in that game, and Im glad I did," Williams said. "Could have definitely changed things. I could still be out there. I really just dug deep and tried to hold. "When I play top players or a Grand Slam winner, such as Kvitova who has such a dangerous game, youve got to go in there knowing that anything can happen, and I have to be really focused." Williams did not stop after the first set and broke serve again for a decisive 3-1 lead in the second. Williams set up a match point with a service winner and won when Kvitovas return sailed into the net. She finished with 11 aces. "I think her serve is really big, so I knew I wanted to hold. I served well," said Williams, who has never lost to Kvitova in five matches. Williams, 32, is enjoying the finest season in her career, having already won 10 titles. She added the French Open and U.S. Open titles to bring her Grand Slam record to 17 championships and is 76-4 for the year. Making her eighth appearance in the event, Williams is looking to become the first player to successfully defend the title since Justine Henin in 2007. Henin was also the last to win 10 titles in a season, in 2007. Williams has clinched the year-end No. 1 ranking for the third time in her career after 2002 and 2009. The key to Lis victory in an error-filled match full of long rallies was her break of serve in the third set for a 4-3 lead. She never looked behind again, winning the last three games. Jankovic hit a backhand into the net on Lis second match point. The fourth-seeded Li has a 2-0 record in the White Group and looks likely to advance to the semifinals for the first time. Seventh-seeded Jankovic is 1-1. Jankovic is back in the tournament for the first time in three years. The two of them and Victoria Azarenka are vying to make the semis. "It was tight, yeah, but at least its better than the last two years," said Li, who won only once in 2011 and 2012. She was pleased to add she had one foot in the semis but her other foot was "still out of the door." Kerber is 1-1 in the Red Group. Radwanska fell to 0-3. "Im feeling good," Kerber said. "I was really playing very well today ... I was focused from the first point." Li holds a 6-4 career edge over her Serbian friend, but she had to work hard for her win. Both players were inconsistent and error-prone. Li had 45 unforced errors and 21 winners, Jankovic 36 unforced errors and 17 winners. "We had a great fight," Jankovic said. "In the third set it was just a couple of points. I got broken in that (seventh) game. She lobbed me, and the ball went on the line." Li followed the lob with a crisp backhand winner to take the game. "They were the crucial points at that stage and made a difference," Jankovic said. Shaun Alexander Jersey . Never caused problems. Never raised a ruckus. Never got sick or hurt while frolicking in the fields of Claiborne Farm in Paris, Ky. Luke Willson Jersey .com) - The Detroit Pistons and Boston Celtics both entered Wednesday nights game riding lengthy losing streaks. http://www.footballseahawksfanatics.com/authentic-bradley-mcdougald-seahawks-jersey/ . Halladays resume as a Blue Jay is among the elite in the franchises 36-year history. Over 12 seasons in Toronto, he was named an All-Star six times. He had arguably the finest campaign of his career in 2003 when he posted a 22-7 record, a 3.SAN ANTONIO -- Blowing their playoff opener turned out to be great therapy for the Dallas Mavericks. Eighth-seeded Dallas rolled to a 113-92 victory over San Antonio on Wednesday night, snapping a 10-game skid against the Spurs and evening their first-round series at a game apiece. Dallas didnt relent in Game 2 after watching a 10-point lead evaporate in the final eight minutes of the series opener Sunday. "Game 1 actually helped a lot more than today," Mavericks forward Dirk Nowitzki said. "We were down after Game 1, but in this building to be up 10 with six or seven minutes left, I think that gave us a lot of confidence coming into this one. Just keep executing the game plan." It was Dallas first playoff victory since June 12, 2011, when it rebounded from an 0-2 deficit to defeat the Miami Heat for the NBA title. If not for the final eight minutes of the series opener, the Mavericks would have a 2-0 lead entering Game 3 on Saturday. "It feels great, but its nothing to celebrate," Dallas point guard Jose Calderon said. "I think we have to keep doing what were doing. I think we played two really good games." In Game 2, the Mavericks used an aggressive offence and a brutal defensive effort that discombobulated the normally even-keeled Spurs, who finished the regular season with the leagues best record. Monta Ellis scored 21 points, Shawn Marion added 20 points, Nowitzki had 16, Devin Harris had 18 and Calderon 12 for Dallas, which never trailed after the opening minutes of the second quarter. Manu Ginobili had 27 points, Tony Parker added 12 and Tim Duncan 11 for the Spurs, who did not have any other player score more than seven points. "They beat us in every aspect of the game," Ginobili said. "They played harder. Our defence was soft (and) not as aggressive as theirs. Not that I dont expect them to play hard. We know they are a tough team, but having such a poor performance in the playoffs bothers me." San Antonios ineptness had as much to do with tying the series as Dallas stellar play. The Spurs averaged 14.4 turnovers during the regular season, but had 15 with 3 minutes left in the first half. They finished with 24 turnovers, which resulted in 33 points for the Mavericks. "Just being very active," Ellis said. "Not put them on the free-throw line. Trust that the help was going to be there. We locked in to the game plan that we had. They made some careless turnovers. That was good for us." Dallas was extremely physical in the first half whenever Parker and Ginobili drove the lane. "NBA playyoff games are physical," Mavericks coach Rick Carlisle said. Luke Joeckel Jersey. "If you dont have the right kind of posture and disposition, youre going to knocked back on your heels and your butt and tonight we did a better job of hitting first in some of those instances." San Antonio coach Gregg Popovich was dismayed early when no fouls were called -- not that it mattered when they were. San Antonio finished 18 for 29 on free throws. "Its a bad combination to not play good defence at one end and give the ball up at the other end and not shoot free throws very well, either," Popovich said. "Thats a bad combination at both ends of the floor. That means you get your butt kicked and thats what happened tonight." Dallas also continued to crowd San Antonios 3-point shooters. Aside from Ginobilis 5-for-6 shooting, the Spurs were 5 for 14 long range after going 3 for 17 in the opener. "Its pretty frustrating," San Antonio wing Danny Green said. "Theyre doing a good job of getting, not just to me, but all our shooters; showing us a lot of respect. But weve got to find other ways to get it done. We cant rely on our Big Three to carry us every night. Got to find a way to get involved, push the pace offensively." The Mavericks attacked the basket with the same intensity, finishing with 44 points. San Antonio pulled within 61-56 with 8:38 remaining in the third quarter when Kawhi Leonard made two of three free throws, but it was the closest it would get in the second half. NOTES: Popovich received a standing ovation before the game after being recognized as the NBA Coach of the Year. Spurs owner Peter Holt presented Popovich with the Red Auerbach trophy, which he has won three times. ... After assigning Spurs nemesis Joey Crawford to officiate Game 1, the league had Danny Crawford on hand for Game 2 to the chagrin of the Mavericks fans. But just as in the opener, both officials reserved most calls and non-calls for the opposition. Crawfords lack of calls led Popovich to scream at Crawford throughout the first half. ... Academy Award-winning actor Tommy Lee Jones sat courtside beside Holt. ... Nowitzki was assessed a technical foul with 1:38 remaining in the first half after Ginobili was fouled by Marion on a 3-point attempt. Marion touched Ginobilis hip as he released the ball, but the Argentinian appeared to exaggerate the contact when he fell to the floor. ... After scrambling to capture a loose ball under the basket, Tiago Splitter flung an overhead, two-handed no-look pass to an open Ginobili for a 3-pointer with 4:44 remaining in the third quarter. 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