Caroline Wozniacki beats Andrea Petkovic in Stuttgart
Page last updated at 19:50 GMT, Thursday, 21 April 2011 20:50 UK
Wozniacki finished strongly after struggling at the start of the first set
Dane Caroline Wozniacki reached the last four of the Stuttgart Grand Prix with a 6-4 6-1 victory over Germany's Andrea Petkovic.
The world number one was 4-1 down in the first set before rallying to win 10 straight games against her opponent.
Australian Samantha Stosur also reached the semis with a 2-6 6-3 7-6 (7-3) win over world number three Vera Zvonareva.
Stosur will now play Julia Goerges, while Wozniacki will face Agnieszka Radwanska.
Goerges won an all-German battle with a 6-4 6-4 victory over Sabine Lisicki, while Poland's Radwanska defeated another German, Kristina Barrois, 7-5 6-3.
"I am sorry to beat the home favourite but I am happy to be in the semis and hope you will support me," said Wozniacki.
"Today I felt good in here and my volleys felt great, an area I have been working on. I am pleased at the way I was able to finish the match today."
Stosur was also delighted with her own performance.
"It is the best match I have had all year," said last year's French Open finalist. "To come through this close and tight match is just wonderful."
The semi-finals will take place on Saturday as there is no play scheduled in Stuttgart on Friday.
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See also
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Azarenka out with shoulder injury
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Wozniacki wins Family Circle Cup
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Azarenka wins second Miami title
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Petkovic stuns top seed Wozniacki
29 March 11Tennis
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Wozniacki wins Indian Wells title
20 March 11Tennis
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