The Canadian tennis star slipped in the locker room following her doubles match with Nick Kyrios on Friday, smacking her head on the wet floor.
She was monitored closely by tournament medics before taking the difficult decision to pull out. She returned to Flushing Meadows on Sunday to officially withdraw before her scheduled fourth round match.
Due to the nature of her injury, Bouchard decided not to speak with the media, but took to Twitter to express her dismay.
Tournament director David Brewer made an official statement saying:
“Eugenie Bouchard is withdrawing from the women’s singles competition at the 2015 US Open due to a concussion.”
The No.25 seed was due to play Roberta Vinci in for a place in the quarter finals, after defeating Alison Riske, Polona Hercog and Dominika Cibulková in the first three rounds.
She was also due to partner Nick Kyrios in the mixed doubles against fourth seeds Martina Hingis & Leander Paes, and join Elena Vesnina in the women’s doubles. She was, up until this point, the only woman competing in all three competitions.
The WTA’s most improved player for 2014 has endured a torrid 2015 by comparison, dropping from 7th to 25th in the world rankings. After first-round exits at both the French Open & Wimbledon, the 21-year-old was looking to end the year on a high with an improved performance in New York.