Umpire Ramos gave Williams a code violation after her coach gestured in her direction early in the second set of Naomi Osaka's 6-2, 6-4 victory over the American.
Carlos Ramos, the chair umpire who penalized Williams is also handling their best-of-five semifinal series against Croatia this weekend.
The Australian cartoonist behind the controversial depiction of Serena Williams jumping up and down on a broken racket has defended himself against claims of racism.
British novelist J. K. Rowling has slammed an Australian cartoonist, Mark Knight for his 'racist' depiction of Tennis ace Serena Williams at the U.S. Open.
US Open Men's champion Novak Djokovic said he thought chair umpire Ramos should not have pushed Williams so hard.
Williams had lost the final 6-2, 6-4 to Japan's Naomi Osaka but the game made the headlines for her allegation that Ramos treated her differently than he would a male player.
For the first time in the United States Open, the trophy ceremony was drowned out by whistles and boos in support of the loser and against the champion.
Williams was cited by official Carlos Ramos for three code violations during her 6-2, 6-4 loss to Naomi Osaka in US Open finals.
Osaka grew up rooting for Serena Williams, even did a report on her way back in third grade. Her dream was to play Serena at the U.S. Open.
On Saturday, Williams will face No. 20 seed Osaka, a 20-year-old who is the first Japanese woman to reach a Grand Slam final.
Williams put aside some early shakiness and an early deficit, turning things around with an eight-game run en route to a 6-4, 6-3 victory over No. 8 seed Karolina Pliskova for a spot in the semifinals.
Serena equalled her most-lopsided victory against her sister with a 6-1, 6-2 rout in the third round of the U.S. Open.
Serena Williams set up the highly anticipated matchup at Flushing Meadows by hitting 13 aces and overwhelming 101st-ranked Carina Witthoeft of Germany.
Serena Williams scored a 6-4, 6-0 victory over 68th-ranked Magda Linette of Poland under the lights at Arthur Ashe Stadium.
If the sisters do play each other, the winner might face no. 1 ranked Simona Halep in the fourth round.
Federer and Williams were making their first appearance at the tournament since they each won the title in 2015. Williams opened with a straight-set victory against Daria Gavrilova.
Williams, a 23-time Grand Slam winner who returned to the tour this year after the birth of her first child, needed just 65 minutes to dispatch Gavrilova.
The 36-year-old, talked about in length what she has been going through since giving birth to her daughter, Alexis Olympia, who turns one this September.
Williams had moments of brilliant shot-making to win long rallies, then would put a drop shot into the net and sigh in disappointment.
Williams has complained before at being drug-tested more than other American tennis players this year.
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