Mark Knight's cartoon of Serena Williams in Melbourne's Herald Sun newspaper has faced a barrage of criticism online for being racist. It pokes fun at the tennis player's heated exchanges with umpire Carlos Ramos during the US Open.

Williams was warned for coaching, then docked a point for smashing a racket before Ramos penalised her a game after she called him a liar and a thief. That left the 23-time Grand Slam singles champion one game from defeat and in tears, with Naomi Osaka clinching her first slam title shortly afterwards.