Wozniacki could miss US Open

Former world number one Caroline Wozniacki could miss the US Open after suffering a knee injury in the New Haven Open.

The Dane was forced out of her semi-final against Maria Kirilenko after picking up the problem during the quarters and was forced to retire after losing the first set 7-5. Wozniacki now faces an anxious wait to see if her knee will respond to treatment, with the sport's final Grand Slam of the season in New York starting at Flushing Meadows on Monday. "I could feel it from the start," she said. "But, you know, it just started to get a bit worse. "I decided to stop because if you don't feel a hundred percent, you can't compete at a hundred percent. It's better to let it rest. I wasn't going to win this match anyway if I'm not on a hundred percent fit level." Wozniacki was bidding to win the event for the fifth time after making her first appearance as an 18-year-old debutant. Kirilenko now goes on to face second seed Petra Kvitova in the final after the Czech ace recorded a convincing 6-1 6-3 win over Sara Errani.