Caroline Wozniacki retired from her semi-final match on Friday against Maria Kirilenko at the New Haven Open, with a knee injury ending her bid for a fifth straight title in the US Open tune-up.
Wozniacki hurt her right knee in a quarter-final victory over Slovakia's Dominika Cibulkova on Thursday. She had lost the first set to Kirilenko 7-5 when she called for the trainer.
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