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The 21-year-old from Montreal withdrew from both her women’s doubles and mixed doubles matches that were scheduled to be played on Saturday, and her status for her fourth-round singles match on Sunday is uncertain.

A statement from the U.S. Open on Saturday afternoon said “the medical staff has recommended that Ms. Bouchard withdraw from today’s competitions, and Ms. Bouchard is following that advice.”

As late as Friday night, after Bouchard had beaten Dominika Cibulkova in a third-round epic, and followed that up with a mixed-doubles victory alongside Australia’s Nick Kyrgios, she had been proud to be the only competitor still alive in three draws.

“That was my ultimate goal when I signed up for all three,” Bouchard said at around 11 p.m. local time after the mixed doubles match. “Very proud of myself for that.” She apparently sustained the injury sometime after that.

Bouchard, the No. 25 seed in women’s singles, is matched up against 42nd-ranked Roberta Vinci in the fourth round. The Italian thumped her 6-1, 6-0 in their only previous meeting, just last week in New Haven. The U.S. Open released its Sunday schedule on Saturday evening, with Bouchard still slated to face Vinci as the anchor match at Louis Armstrong Stadium. The match would not take place until the evening hours, giving Bouchard another full day to recover.