Osaka made headlines this week for her part in the Serena Williams controversy that threatened to overshadow Japan's first Grand Slam singles victory.
Mouratoglou admitted afterwards that he had tried to coach Williams, who said she never saw the Frenchman's gestures.More news: Weather Channel uses mixed reality to show the effects of a hurricane
Or the post was too much for Twitter (it's not clear which.) As of Tuesday morning, Knight's Twitter account - where he was flooded with comments after proudly posting the cartoon on Monday - was no longer active.
"If the self-appointed censors of Mark Knight get their way on his Serena Williams cartoon, our new politically correct life will be very boring indeed", another passage from the cover reads.
PARIS, FRANCE - MAY 30: Naomi Osaka of Japan celebrates during her ladies singles second round match against Zarina Diyas of Kazhakstan during day four of the 2018 French Open at Roland Garros on May 30, 2018 in Paris, France.
Apart from being levied three code violation, Serena was later fined United States dollars 17,000, stirring the tennis world and triggering a broader debate about double standards towards men and women in the sport.More news: Amazon chief Jeff Bezos gives $2bn to help the homeless
"We can not measure ourselves by what we think we should also be able to get away with", Navratilova wrote.
She described Williams' behavior on court as "out of line". She used her powerful serve and groundstrokes to outhit Williams in the final on Saturday.
"Three days before I had drawn a cartoon about Nick Kyrgios being led off by the ears, like you used to do with your children", he said. But on Friday she was pictured speaking with Ramos and Associated Press (AP) journalist Andrew Dampf reported that she apologized to him. "She was insisting that she doesn't cheat - completely believable, but besides the point - while he was making a call over which he, at that point, had little discretion". Williams called Santos a "thief" for the coaching ruling and in response Santos issued a third code violation, handing the game to Osaka. "If, in fact, the guys are treated with a different measuring stick for the same transgressions, this needs to be thoroughly examined and must be fixed".More news: Ryan Thomas crowned the victor of Celebrity Big Brother