Petra Kvitova advances to semis
NEW HAVEN, Conn. -- Caroline Wozniacki remained undefeated in New Haven on Thursday, but her quest for a fifth consecutive title here may hinge on her right knee.
Wozniacki suffered an injury early in the second set of her 6-2, 6-1 quarterfinal win over Dominika Cibulkova of Slovakia. She was hopeful, but not certain, that she would be able to play in Friday's semifinal against Maria Kirilenko.
"You need to judge whether you can continue or you cannot," she said. "You need ...
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