The 36-year-old received three warnings for coaching, smashing her racket and calling the umpire a thief in the tense match on Saturday. An indignant Williams emphatically defended herself, denying she had cheated.
The Herald Sun newspaper in Melbourne, Australia, faced criticism for the image, described by some as a "crude stereotypical depiction" of a black woman jumping on her racket. It also showed her opponent Naomi Osaka, of Japanese and Haitian heritage, as a petite pale woman speaking to the umpire as he asks her to "Let [Serena] win".
"I was deeply offended".
The cartoonist "completely missed the point of why she was upset", De Luca told The Associated Press.
"I drew her as an African-American woman".
Australian cartoonist Paul Zanetti weighed in saying it was the job of cartoonists to call out bad behaviour and not fall prey to an increasingly politically correct culture.More news: After Serena Williams tirade, tennis umps consider boycotting her matches
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The newspaper claimed on Tuesday that the illustration, which depicts Williams as an overgrown baby having a tantrum with exaggerated lips, nose and muscles, had "nothing to do with race".
The newspaper also tried to suggest News Corporation - owned by Rupert Murdoch, and the publisher of news.com.au - had stirred racism "for decades" and bizarrely suggested this had intensified as the Liberal party struggled in the poll.
In a searing piece, The Washington Post's cartoonist Michael Cavna said the "racist" sketch was reminiscent of the "vile imagery" popularised during the era of racial segregation in the US. The truth presented here is of quite a different order, but it nevertheless expresses something we need to pay attention to because it takes us to the very heart of the risky times we live in. The front page of the Herald Sun, he added, "spelt out exactly where we are at this point". It is therefore only logically that she be treated in a hostile manner by the forces for whom the image of black female excellence, success, autonomy, self-confidence and wealth is a threat.
Berniece King, the chief executive of the King Center and daughter of Martin Luther King Jr. said about Knight's imagery, "It was "without consideration for the painful historical context of such imagery and how it can support biases and racism today", "Why wouldn't a human being care about that?" as documented by The Guardian".
Australian writer Maxine Beneba Clarke said she believed the front page demonstrated a "misunderstanding" of the criticism levelled at the cartoon.
The headline reads: "Welcome to PC world" and includes the Williams cartoon and a collage of several other Knight caricatures.
"Political correctness is really all about censoring, it's about being bullied into conforming to a view of the world", he said, AP reported.