It was enough to get under his thin-skin and some say it enabled newcomer Naomi Osaka to secure her first US Open win against her idol.
Umpires are allegedly unhappy at how 2018 US Open women's final umpire Carlos Ramos was treated during and after the match.
A video emerged on Twitter yesterday of a young Osaka setting up a "chopstick competition" with her older sister Mari, where the aim was to see who could place 10 beans into a bowl and then take it out the quickest - with chopsticks!
Serena Williams of the United States (2nd R), while being interviewed after her defeat in the Women's Singles finals match to Naomi Osaka (2nd L), of Japan at the 2018 U.S. Open at the USTA Billie Jean King National Tennis Center in New York City on September 8, 2018.
The first violation was for coaching, which Williams argued against.
"I've said far worse", McEnroe, a seven-times Grand Slam singles victor, said on ESPN.
"At the end of the day, Serena could have handled it a little bit differently", Adams said.
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Williams received a second penalty for throwing her racket to the ground and breaking it after losing a point.
At the press conference after the match, Williams said that the umpire's sanctions were an act of sexism, according to CNN.
Williams claimed the male umpire only handed her a game penalty because he was being sexist but Strycova disagrees with those remarks. In comparison, I never saw Nadal shouting like that with an umpire.
There are men out here that do a lot worse but because I'm a woman, because I'm a woman you're going to take this away from me?
The potential stance comes after the Women's Tennis Association (WTA) and United States Tennis Association (USTA) supported the athlete following her claims of sexism against chair umpire Carlos Ramos in the final.
Ramos, 47, was "thrown to the wolves for simply doing his job and was not willing to be abused for it", one anonymous umpire told the English paper.
The International Tennis Federation has defended Ramos for his actions during the final. Asked to address the disparity in Williams' fines and Roger Federer's $1,500 fine for an expletive-laden outburst during the 2009 U.S. Open men's final, Adams said the fines are up to the discretion of the grand slam administrator, not the USTA.
Other umpires are reportedly not so cool with the outrageous smearing of Ramos.