The altercation happened during Saturday’s U. Open final.
The cartoon has been condemned as racist by civil rights leaders, celebrities and fans.
She also said he treated her differently than male players during her loss to Naomi Osaka.
Williams was handed three code violations — and docked a point and then a game — in her 6-2, 6-4 loss to Naomi Osaka in the Flushing Meadows final
Naomi Osaka became the first Japanese to win a Grand Slam singles title on Saturday as her idol Serena Williams angrily imploded, calling the chair umpire in the US Open final "a thief".
Serena Williams shrugged off a shaky start to beat Czech Karolina Pliskova 6-4, 6-3 to make the US Open semi-finals for the 12th time in her stellar tennis career.
Alexis Ohanian shared a snap of his daughter with his wife and professional tennis player, Serena Williams, on Instagram for the girl’s first birthday Saturday.
The six-time champion, playing not as sharp as when she played her sister Venus on Friday, raced through the first set with a bagel, but her performance dipped in the second set as she lost 4-6.
Serena Williams took the first cautious step towards a record-equalling 24th Grand Slam title with a 6-4 6-0 first-round win over Magda Linette on Monday as an excited US Open crowd welcomed the new tennis mother back to the ‘Big Apple’.
Sloane Stephens will be defending her title at the US Open but all eyes will be on Serena Williams over the coming two weeks as the six-times champion attempts to win her first Grand Slam title since becoming a mother.