|2018 US Open|
|Venue: Flushing Meadows, New York Dates: 27 August-9 September Coverage: Live radio coverage on BBC Radio 5 live sports extra; live text commentaries on the BBC Sport website|
French world number 31 Alize Cornet was given a code violation for taking her shirt off on court during her US Open first-round defeat by Johanna Larsson.
Cornet changed her shirt during the break between the second and third sets, but realised it was back-to-front and quickly switched it on court.
But the chair umpire gave her a warning – despite male players being permitted to change their shirts on court.
Cornet lost 6-4 3-6 2-6 to Sweden’s Larsson in the searing New York heat.
On Tuesday, temperatures close to 38C (100F) at Flushing Meadows were made more stifling by humidity levels of more than 50%, with five male players forced to retire because of heat-related issues.
The Women’s Tennis Association’s (WTA) rules state female players are not permitted to change their clothing on court, and instead must do it in a dressing room.
Male players regularly change their shirts on court at the switch of ends.
Former Australian tennis player Casey Dellacqua called Cornet’s warning “ridiculous” while five-time Grand Slam doubles champion Bethanie Mattek-Sands said it was “weak”.