Yahoo Sports 
Bouchard withdraws from doubles, deciding on singles
NEW YORK – No. 25 Eugenie Bouchard of Canada may have to withdraw from the women's singles draw due to a head injury sustained Friday night when she slipped and fell in the locker room.
The USTA announced Saturday afternoon that Bouchard has already withdrawn from women's and mixed doubles. According to the statement,
Following the competition yesterday evening, Ms. Bouchard slipped and fell in the locker room and sustained a head injury. The severity of the injury was and continues to be assessed by the on-site medical personnel at the US Open. The medical staff has recommended that Ms. Bouchard withdraw from today’s competitions, and Ms. Bouchard is following that advice. No determination about competing in the singles competition has been made at this time. Ms. Bouchard will continue with medical evaluation and treatment for the remainder of the day.
Bouchard had been playing mixed doubles with Nick Kyrgios and women's doubles with Elena Vesnina.
A quarterfinalist at this year's Australian Open, she lost in the first round at Rolad Garros and Wimbledon. She advanced to the fourth round here for the first time in her career on Friday, with a 7-6, 4-6, 6-3 win over Dominika Cibulkova. She is scheduled to play Roberta Vinci on Sunday.
The statement did not say whether it was a concussion. Bouchard had gone into the locker room shortly after her and Kyrgios won their mixed doubles match late on Friday night. She had defeated Cibulkova earlier Friday. She had been the only player alive in all three draws.
