Zhang Shuai ended up forfeiting following Amarissa Kiara Tóth's shocking move at the Budapest Grand Prix.
The Serb taunts Centre Court spectators during straight sets semi-final win over Jannik Sinner.
The tennis champion recently welcomed her newborn with boyfriend and rapper Cordae.
It was a "regrettable incident", according to one commentator.
The four-time Grand Slam singles champion announced her pregnancy on social media in January.
The 66-year-old tennis legend learned she had both breast and throat cancer in December.
The broadcaster bid a tearful farewell to her role of fronting the annual tennis tournament earlier this year.
"I wouldn’t be Serena if there wasn’t Venus, so thank you Venus."