ISTANBUL, Turkey -- Top-ranked Serena Williams overcame Agnieszka Radwanska 6-2, 6-4 for her second win in two matches at the WTA Championships on Wednesday and all but sealed a spot in the semifinals. Jelena Jankovic topped second-ranked Victoria Azarenka 6-4, 6-3 in her first match at the tournament and fourth-seeded Li Na opened her campaign with a 6-3, 7-6 (5) victory over Sara Errani. Williams cruised in the first set but ran into some trouble in the second against a player she had never lost to in seven previous matches. "She definitely played pretty well. But, you know, I can always look to improve on some things. My serve wasnt as good today as it was yesterday, but you cant expect it to be great every day," Williams said. Radwanska wasted three break points at the start of the set and dropped her serve in the fourth game. She broke right back and levelled at 3-3, but Williams pounced on her serve again in the final game, winning the match with a backhand winner. Radwanska has won just one set of 17 she has played against Williams overall - in the 2012 Wimledon final. She has now dropped both round-robin matches in Istanbul, where she also lost to Williams in last years semifinals. Williams is bidding for her fourth title in the event. Errani also lost her opening group match on Tuesday to Azarenka and now looks all but certain to be eliminated. Jankovic, who was ranked No. 1 in 2008 and is back in the top 10 for the first time since 2011, outplayed Azeranka to snap a four-match losing streak against a fellow former No. 1. "Vika is a great champion, and I knew it was going to be a tough match. We played against each other in Cincinnati and I lost in three sets, and I think the difference today was that I was serving much better," Jankovic said. 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 75-4 for the year. Williams, making her eighth appearance in the event, 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 Li trailed 3-1 in the second set against Errani, but won the next four games. She twice attempted to serve for the match, first, wasting a match point at 5-3 and then again at 6-5. Despite trailing 3-1 in the tiebreaker, Li won the next five points and eventually converted her third match point when Errani sent a forehand into the net. That saw her take her head-to-head meetings against her Errani up to six wins without defeat. "The first match is always tight," Li said, adding that she had felt rusty after a three-week break since her last tournament. "I still have to find the rhythm on the court." The tournament brings together the top eight players in the world. They play two round-robin groups, with the top two finishers in each advancing to the semifinals. Jankovic, now ranked No. 8 and seeded seventh because third-ranked Maria Sharapova pulled out of the event with a shoulder injury, proved to be the steadier player against Azarenka, the Australian Open champion. "I was able to hold my serve and stay focused when I was serving and I waited for my chances to break, and she made some double faults at times and I took advantage of that," Jankovic said. "Its a great win for me, it gave me a lot of confidence." The key game in the first set went to Jankovic after more than 10 minutes when she held serve for a 5-3 lead. Azarenka saved two set points in the next game but then sent a forehand wide on Jankovics fourth in the 10th game. Azarenka dropped her serve in the third game to fall behind and then held in the fifth despite serving three double-faults and facing four break points. But she could not trouble Jankovic on her serve and another forehand by Azarenka that sailed long to hand Jankovic the match. "Of course she was playing well. I mean, I think shes playing her best tennis right now. Really improved a lot throughout the year, " Azarenka said. "But I cannot say that I played well and she was better today. Of course she was better today, but, you know, I let a lot of balls go. There were a lot of mistakes, small mistakes, a little bit bigger mistakes." After losing the U.S. Open final to Serena Williams, Azarenka lost her opening matches in both Tokyo and Beijing before beating Errani on Tuesday. Azarenka still has a 5-4 career edge over Jankovic. 16:56ET 23-10-13 Custom Vegas Golden Knights Jerseys . Hattestad managed to avoid the carnage midway through the mens final, as a crash took out three skiers, essentially leaving two men vying for gold. The Norwegian posted a time of 3:38.39, outlasting Swedens Teodor Peterson, who took silver with a time of 3:39. Oscar Dansk Jersey . The Durban-based Sharks withstood a furious second-half fightback to beat the Queensland Reds 35-20 for a fourth straight win which gave them a five-point lead atop the championship table. The Hamilton-based Chiefs scored two late tries to beat the Cape Town-based Stormers 36-20 for their third win, after the Stormers rallied from 24-6 down to 24-20 with six minutes remaining. http://www.officialgoldenknightsfanstore...ts-jersey-c-24/. Then again, he really was at his home away from home. "It was nice to sleep in my own bed last night," Shields said after pitching Kansas City past the San Diego Padres 8-0 Wednesday. Marc-Andre Fleury Jersey . Its been a successful Games for Canada, which will finish near the top of the medal standings again. From repeat gold medal winners to multiple medal winners to undefeated teams to acts that define the Olympic spirit, there are many solid candidates who could be considered to receive the honour. Erik Haula Jersey .com) - Guard Greivis Vasquez and forward Patrick Patterson, two key pieces to the Toronto Raptors run to an Atlantic Division title in 2013-14, were both given qualifying offers by the team on Saturday.Before the 2013-14 NCAA season began, CBSSports.com listed Syracuse point guard and Toronto native Tyler Ennis at 69 on its "Top 100 Players in college hoops." Michigan guard and fellow Canadian Nik Stauskas was one ahead at 68. With 42 days before the NBA Draft in New York City, two of three analysts of the same website have Ennis getting selected in the top 10, while all three have Stauskas going in the 10-14 range. "Ive played against some of the best players in the world and Ive played against some of the best players in my class," Ennis said at the NBA Combine, which began Thursday. "I just have the confidence and I know how hard I work and I know my abilities." Played is the operative word in that sentence. For as much as the 19-year-old Ennis and 20-year-old Stauskas did to get noticed on the court, they both understand to fulfill their NBA dreams theyll have to impress potential employers off the court just as much. "People know how I play and I think the main thing for teams is to get to know me and know if they are going to draft me, what theyre going to deal with," Ennis said. "They want to see, as a nineteen-year-old coming out of college, if youre able to lead grown men in the NBA and I think they are able to get a feel for that in the interviews." The process is something all players have to go through and Stauskas is doing his best to combat the expected nerves. "The main thing for me is to just try to be myself and let teams know what kind of person I am and how I grew up and how I got to this situation right here," the Mississauga native said. Stauskass upbringing could serve him well when talking to NBA clubs. His family originally hails from the basketball-mad Lithuania. "t;Im a good person, really hard-working, and I come from a great family.dddddddddddd I think thats important for people to know and I just want them to know that Im not doing this because I want money or anything like that," he said. "Obviously, the moneys great, but Im really doing this just because I love the game of basketball. This is whats made me happy since I was seven or eight-years-old. I feel like if teams really get that vibe from me, theyre going like that." Both Stauskas and Ennis sat out the first day of the combine. Each player was officially measured - height, weight and wingspan - but neither participated in any of the on-court drills. "Before the combine started, knowing what the drills were going to be, I felt a lot of it was just jump-shooting," Stauskas said. "Obviously, thats the strongest part of my game and I feel that teams already know I can shoot the ball, so coming in, I felt that even if I had a great day shooting the ball, it wasnt really going to do much for me because teams already know thats my strength." Both Canadians, however, will participate in physical testing and the aforementioned team meetings. And although the footage of their abilities is likely endless at this point, both players say there will be a few surprises awaiting any and all who will be watching. "Im not the one dunking all the time but Im able to jump pretty high and Im a lot faster than people think," Ennis said. "Going through the combine I think my numbers will show that its more surprising than people expect. "I dont think people realize I can jump the way I do or run the way I do," Stauskas echoed, "so Im really looking forward to tomorrow, getting in there and working." 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