Injured Wozniacki through to New Haven semis
Caroline Wozniacki battled through a knee injury to beat Dominika Cibulkova 6-2 6-1 for a place in the semi-finals of the New Haven Open.
The four-time defending champion is bidding to become only the fourth woman to win the same WTA event in five consecutive years, though it remains to be seen whether she can continue with her quest after needing treatment on her right knee.
Having broken twice to claim the first set, Wozniacki said she felt a twinge in her knee after hitting a backhand return in the first game of the second set. With her opponent double-faulting on the next point, Wozniacki grabbed a bad of ice and called for the trainer, who proceeded to tape her knee.
"I decided straightaway after I felt it," she said. "I played one more point and decided I needed to see the trainer because I felt a sharp pain in there. I needed to treat it."
She returned to the court and, although clearly hampered at times, she won six games in a row after dropping the first to clinch victory.
A clearly disgruntled Cibulkova said: "I was paying too much attention to her. When you ask for a physio like this, I was serving, it was my game, it was during the game, it doesn't happen often. When you do it, it has to be serious. You really either cannot move or you cannot continue or something like that."
Wozniacki remains unsure whether she will be fit in time to take on Maria Kirilenko, who reached her second New Haven semi-final in three years after beating qualifier Olga Govortsova 6-1 6-2.
"You need to judge whether you can continue or you cannot," Wozniacki added. "You need to judge whether it's going to get worse or it's not. That's all decisions you need to make yourself, decisions that are important because you don't want to jeopardize long-term injury. Doesn't matter what tournament it is."
Petra Kvitova dispatched friend and compatriot Lucie Safarova 6-3 6-3 to reach the last four and clinch the US Open series title. The Czech will face Sara Errani in the semi-finals after the Italian defeated Marion Bartoli 6-4 6-2.
Meanwhile, at the Texas Open, Jelena Jankovic booked her place in the final with a 7-5 6-4 victory over Casey Dellacqua. Jankovic will meet Roberta Vinci in the final after the Italian whitewashed Bojana Jovanovski 6-0 6-0.