STUTTGART, Germany -- Two-time defending champion Maria Sharapova needed eight match points to put away top-seeded Agnieszka Radwanska 6-4, 6-3 Friday for a place in the Porsche Grand Prix semifinals. Sharapova has won 11 consecutive matches on Stuttgarts indoor clay. Her semifinal opponent will be eighth-seeded Sara Errani, who was leading 6-3, 6-7 (6), 3-0 when Carla Suarez Navarro retired with a hand injury. "This was a big victory for me, the biggest since my injury," said Sharapova, who returned late last year after missing more than four months following shoulder surgery. Ana Ivanovic outlasted 2009 Stuttgart champion Svetlana Kuznetsova 6-3, 2-6, 6-4 in a battle between two former French Open winners. Ivanovic is seeking her third title of the year and is the only player remaining in the tournament to have won an event this year. Radwanska played her best tennis in the penultimate game, when she fought off six match points and finally broke Sharapovas serve. Under pressure from Radwanska, Sharapova made two straight backhand errors as she dropped her serve. But Radwanska could not keep the momentum and Sharapovas forehand winner down the line gave her two more match points. Sharapova wasted the first with a wild forehand that was both long and wide, but then nailed a forehand winner to the corner to end the match. Sharapova is aiming for her first title of the year and the 30th of her career. Ranked No. 9, she would have fallen out of the top 10 with a loss Friday. "Ive been on the tour for so long I wasnt really thinking about it," she said. Suarez Navarro received treatment after winning the second set and quit three games later. "I feel really sorry, I have huge respect for her," Errani said. "It is not easy to play her. I tried to move her around and to be aggressive." Best Cheap Fake Shoes . 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Raburn hit a tiebreaking single and David Murphy drove in four runs, leading the Indians to a 12-6 victory over the White Sox. "Its a team win," Raburn said. "Just to be able to be in that position to help us out, I mean, thats a tribute to our team putting us in that position." Murphy, Nick Swisher and Jason Kipnis homered for Cleveland, which snapped a three-game losing streak. Murphy added a bases-loaded triple in a four-run ninth against Donnie Veal. The Indians improved to 18-4 against the White Sox since the beginning of last season, overcoming another shaky start by Justin Masterson. They will try for a split of the four-game series Sunday. "It was a long day of good at-bats and we needed them," Indians manager Terry Francona said. Adam Eaton had two hits, including his first homer, and walked twice for the White Sox, who have scored five or more runs in nine of their 12 games this season. "Were going up there with an approach and trying to execute the approach," Eaton said. "It will come around and well be just fine. I love seeing the fight." Alexei Ramirezs nifty slide past catcher Carlos Santana tied it at 6 in the fifth, but Raburn put the Indians ahead to stay with a two-run single in the seventh. The Indians loaded the bases with one out against Ronald Belisario (1-1) and Scott Downs. Daniel Webb came in and got Asdrubal Cabrera to foul out, but Raburn followed with a bouncer into centre field to make it 8-6. "They got a chance to wiggle out of that with a tie game at home and Raburn smacks that ball up the middle and gives us the lead," Francona said. "That was huge." Raburn, who began his career with Detroit, has a .301 batting average, 17 homers and 72 RBIs in 97 career games against Chicago. "This is one of those places, I feel pretty comfortable up there," he said. "Ive faced these guys so many times you kind of get a knack for what theyre trying to do, but youve still got to put the bat on the ball." RRaburns big hit handed a win to Josh Outman, one of four relievers who shut down the White Sox after Masterson laboured through 4 2-3 innings.dddddddddddd Outman (2-0), Bryan Shaw, Cody Allen and John Axford combined for 4 1-3 innings of one-hit ball. Masterson was charged with six runs, five earned, and seven hits in his first start since he lasted just 3 2-3 innings against Minnesota last Sunday. The right-hander also walked five to go along with seven strikeouts. "I was decently happy with the way things took place as far as how I felt when I let go of the ball," Masterson said. "Sometimes after letting go of the ball, the things I cant control, they got me a little bit." Masterson dominated the White Sox last year, going 4-0 with a sparkling 0.83 ERA in 32 2-3 innings. Chicago right-hander Felipe Paulino also had a rough start, allowing six runs and six hits in five innings. "Ive been fighting a lot executing my pitches (the) last couple of games," Paulino said. "But I miss a lot of spots. ... My slider comes sometimes, but Im looking for consistency." Francona won a replay challenge after Nyjer Morgan was picked off in the first, leading to three runs. The overturned call put Morgan back at first base, and he eventually scored on Michael Brantleys two-run single. Cabrera added a run-scoring groundout. Eatons homer gave the White Sox a 5-4 lead in the second. Cleveland went back in front when Swisher and Kipnis connected in the fifth. It was the first set of back-to-back homers for the Indians this season. NOTES: Indians OF Michael Bourn (strained left hamstring) will play another rehab game with Double-A Akron on Sunday. "I think hes feeling pretty good. I think the last thing is being able to get to that gear and not having to think about it. Thatll be when hes ready to go," Francona said. ... Indians RHP Corey Kluber (1-1, 7.71 ERA) and White Sox LHP Jose Quintana (1-0, 2.77) square off in the series finale. ... The Indians are off Monday, and Francona said RHP Carlos Carrasco will work out of the bullpen before making his next start Saturday against Toronto. Carrasco allowed five runs and six hits in 4 2-3 innings during Fridays 9-6 loss to the White Sox. ' ' '