At the
US Open, Bouchard defeated Alison Riske and
Polona Hercog in the first and second round, respectively, which became her first back-to-back wins since March at the Indian Wells Open.
[92] In the third round, Bouchard defeated Dominika Cibulková in three-sets to reach the second week at the US Open for the second straight year.
[93] The tournament was seen as Bouchard's return to form, as she was also advancing in the doubles and mixed doubles.
[94] Bouchard was scheduled to play Roberta Vinci in the fourth round, but was forced to withdraw due to a concussion, an injury she suffered after slipping and falling in the locker-room.
[95] A subsequent lawsuit was filed against the
United States Tennis Association (USTA) on her behalf, with the parties reaching settlement in 2018.
[96] The injury forced Bouchard to withdraw from other tournaments
[94] and she played only one match in the remainder of 2015, against Andrea Petkovic at the
China Open, a match she had to retire from in the second set after suffering from dizziness.
[97] Bouchard ended 2015 as world No. 48 in the
WTA rankings.
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