ISTANBUL, Turkey -- Li Na swept past the ailing Victoria Azarenka 6-2, 6-1 to earn a place in the semifinals of the WTA Championships at the expense of the second-ranked Australian Open champion on Friday. The fourth-seeded Li will play 2011 champion Petra Kvitova, who came from behind to beat Angelique Kerber 6-7 (3), 6-2, 6-3. Azarenkas loss meant Jelena Jankovic advanced to the semis before she had to play Sara Errani later Friday. Errani won that match 6-4, 6-4. Jankovic will play defending champion Serena Williams. Williams swept her group on Thursday. Williams has a 7-4 career edge over Jankovic, while Li and Kvitova are tied 3-3. Azarenka hurt her back while serving in the sixth game of the first set and was clearly in pain for the rest of the match. She took a medical timeout and received treatment during several changeovers but stayed on court despite being hardly able to move and wincing in pain, at one moment coming to tears. "I just wanted to try to do my best for the fans who came and watched our match, for respect for my opponent. It was just about trying to do the most you can out there," Azarenka said. She did win one game with some ferocious serving, but mostly stayed in the middle of the baseline and tried to hit quick winners if the ball came her way. "You know, in the end of the day, its my decision what Im going to do," Azarenka said. Azarenka said her back suddenly seized up as she tried to serve hard but that the trainers told her there was no structural damage. The fifth-seeded Kvitova, a former Wimbledon champion, led 4-1 before Kerber battled back to level at 5-5. In the tiebreaker, Kerber kept up the pressure on Kvitova, who double-faulted to set up three set points for her opponent. Kerber converted the first with a service winner. In the second set, Kvitova broke for the second time in the seventh game by first playing a crisp volley winner and then hitting a powerful return. "The beginning of the second set was really tough. She had a lot of chances," Kvitova said. "I just tried to play my game, play some winners, and go for the net." There were three straight breaks at the start of the third, before Kvitova fought off two break points to go up 3-1. She sealed the win thanks to two straight errors by Kerber. Kerber was seeded eighth after the withdrawal of third-ranked Maria Sharapova because of a shoulder injury. Kvitova had to withdraw from last years tournament with an injury after the first match. "I gave everything I could today," Kerber said. "Of course, Im a little bit disappointed, but Petra was playing very well in the important moments. My serve was not really the best today, but yeah, I was just trying everything." Li, who lost to Azarenka in the final of the Australian Open and in both previous round-robin matches at the WTA Championships 2012 and 2011, said her toughest challenge Friday was mental. "I mean, today the match is not about tennis, about fitness ... because I thought maybe after the first set she will give up or retire, but she still try to continue to play," Li said. "I think its tough because I have to focus, hope all time, because you never know what happen on the court." In the Australian Open final, it was Li who was in trouble. She twisted her ankle and hit her head in a stumble before losing in three sets. "Next time we both have to be healthy on the court," Li said. Li won the group 3-0, while Azarenka finished 1-2. Azarenkas loss meant Jelena Jankovic advanced to the semis before she had to play Sara Errani late Friday. Jankovic will play defending champion Serena Williams in the semifinals. Williams swept her group on Thursday. Although she did not play, Williams did appear on court, to collect the award for finishing the year as No. 1 in the world. Williams has clinched the year-end No. 1 ranking for the third time in her career after 2002 and 2009. Li is through to her first semis in three appearances in the elite event that brings together the top eight women. Despite failing to reach the semis, Azarenka said she was pleased with her year. "Im No. 2 in the world. I had great results in the big tournaments and I had injuries," Azarenka said. "So, its that balance of good and unfortunate. I think I can learn a lot from these little things to prevent maybe some of the injuries." Kvitova finished 2-1 in her group and Kerber was 1-2. Achraf Hakimi Real Madrid Jersey . Chris Capuano. Shane Greene. And now, Esmil Rogers. Lucas Vazquez Real Madrid Jersey .com) - The Toronto Blue Jays will look to snap a three-game skid Friday night when they continue their road trip in the opener of a three-game set against the Cincinnati Reds at Great American Ball Park. http://www.realmadridfcprohop.us/Nacho-Fernandez-Real-Madrid-Jersey/ . Watch the game live on TSN and TSN GO at 9pm et/6pm pt. 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MMAjunkie.com received a statement from the organization refuting any current uniform deals. "We continue to speak to many potential partners and will make an announcement when we reach an agreement," the statement read. A UFC uniform deal has been rumoured for some time now. It has caused quite a ripple within the organization, especially with president Dana White. The situation boiled over in mid-February, a few days before UFC 170: Rousey vs. McMann. During a media scrum, White let off some steam surrounding the gossip. "We havent announced a uniform deal, we have no uniform deal. We said that its something that were looking into. Theres no (expletive) uniform deal, were working on it," he said. "Its (expletive) ridiculous, there is no deal, and were sitting here talking about something that doesnt exist." However, fighters past and present remain curious about the prospects. At the beginning of March, formeer lightweight and featherweight title contender Kenny Florian, now a television personality, told MMA website Bloody Elbow he thought it could be a good deal for the organization.dddddddddddd "I think if its something that benefits the fighters and benefits the UFC, then I think its great, but I dont know exactly what is going to happen." he said. At the same time, undefeated welterweight Alberto Mina wasnt against the idea but also wasnt overly thrilled. "I believe every fighter has their own characteristics, their own body types, and their own way on how they feel better about themselves," he also told Bloody Elbow. "I think its a very personal thing. Dont take me wrong, but I think its not really necessary." Theres is no way to tell how far away, if at all, the UFC is to locking down a uniform deal, but other reports speculate that the UFC has already reached a deal with fitness apparel giant Under Armour. In addition to those reports, and with the photos featuring Weidman in overtly labelled Under Armour gear, there is speculation an announcement of a deal could come at UFC 182: Jones vs. Teixeira in Maryland, where the company was founded. Nonetheless, the statement to MMAjunkie denies any and all murmurs. The UFC also denied comment on the photos as well. "We havent reached an agreement at this time." 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