When 28-year-old Cornet returned from a 10-minute heat break in NY she realised her shirt was back-to-front and walked to the back of the court to pull off and adjust her top, briefly exposing her sports bra.
Cornet returned from a break in action during her match Tuesday with her shirt on backward.
No wonder, Cornet, who had her sports bra on, was shocked by that, before she went on to lose 6-4 3-6 2-6.
The umpire, Christian Rask, immediately hit her with a code violation.
The WTA says "medically approved clothing changes of female players must be performed off court in the most private location". "Unsportsmanlike conduct. But the men can change shirts on court", she wrote on Twitter.
Alize Cornet sits during a break in her first round at the 2018 US Open at Billie Jean National Tennis Center in New York, Aug. 28, 2018.
Afterwards, social media users called the punishment "sexist". This is not considered a code violation.
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'We regret that a Code Violation was assessed to Ms. Cornet yesterday.
Just before the set began, Cornet removed her shirt in order to put it on correctly.
"We have clarified the policy to ensure this will not happen moving forward".
Due to the sweltering conditions at the tournament this year - tops of 38 degrees Celsius - players are offered a longer than usual 10-minute break as a reprieve from the heat.
"Players who do change their shirts will not be assessed a code violation", US Open Director of Communications Chris Widmaier said Wednesday. Luckily, she was only given a warning with no other penalty involved.
The extreme heat policy allows female tennis players a 10-minute break before the third set begins with temperatures at Flushing Meadows touching 38C. "Men change their shirts on court all the time. that's ridiculous!" another fan tweeted.
Temperatures on the court were well over 100-degrees Fahrenheit and numerous players in the tournament suffered under the heat.