The Herald Sun has also backed Knight in the face of worldwide criticism.
In the face of worldwide condemnation, what did the Herald Sun (published by a subsidiary of Rupert Murdoch's News Corp) do?
The editorial argued that the cartoon was merely another piece from Knight that targeted the powerful.
Knight defended his illustration of Williams as a baby having a tantrum, saying it had "nothing to do with race".
"If the cartoon was purely about bad behaviour I don't see why she had to be depicted the way she was".
This has further ruffled the feathers of some umpires, with an anonymous official revealing there is a growing consensus that umpires are "not supported" by the USTA, while Ramos was "thrown to the wolves for simply doing his job and was not willing to be abused for it".
The cartoon also shows Naomi Osaka, a dark-skinned Japanese woman, as a white blonde.
"I was deeply offended. There are still some of us who enjoy humour".
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The cartoonist "completely missed the point of why she was upset", De Luca told The Associated Press.
"These were the images used to justify African enslavement and racial segregation in the past; they are still used to control black lives in the present", she says. "It's like our opinions don't matter".
It led people, including author J. K. Rowling, to accuse the newspaper of racism.
"This isn't satire - it is disgusting racist caricature", Twitter user Rose Weber wrote on Tuesday.
The cartoon has been widely criticised as "racist". Past year a former editor of the Murdoch-owned Sun, Kelvin MacKenzie, quit as a contributor to the tabloid after writing a column comparing a soccer player with part-Nigerian heritage to a gorilla.
Herald Sun editor Johnston had also defended the cartoon on Twitter.
The image of the front page includes a series of other cartoons the newspaper was suggesting could offend.
The Herald Sun reprinted the controversial cartoon showing the tennis great's "meltdown" at the US Open, along with the headline: "Welcome to PC world".
On Saturday, the 20-year-old Osaka claimed her maiden grand slam title in extraordinary circumstances at the US Open, as a furious Serena Williams embroiled in a row with umpire Carlos Ramos.