The jury in federal court in Brooklyn, where Bouchard sued the body that organizes the US Open, needed less than an hour of deliberation to find USTA negligence was the main culprit in the fall that left Bouchard with a concussion and forced her to withdraw from the tournament.
She did not play a complete a match for the rest of the 2015 season.
The New York Times reported that the jury found the USTA 75 percent responsible, but assessed Bouchard's contributory negligence at 25 percent.
Bouchard is seeking damages for physical and emotional suffering in the lawsuit, as well as lost earnings on and off the court.
The damages phase of the trial is to begin on Friday.
Bouchard, 23, testified on Wednesday that she screamed in pain when she fell in a physiotherapy room at the Billie Jean King National Tennis Center in Flushing Meadows, because her skin was burned by a cleaning spray applied to the floor.
Bouchard's lawyers have claimed that the fall and injury hindered her career. Once ranked fifth in the world, she has fallen to 116th and has not replicated her early success, which included reaching the Wimbledon final in 2014.
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