The final was won by Naomi Osaka of Japan - with the enormously talented 20-year-old claiming her first major title - but it will be remembered for the controversy prompted by a furious outburst from Williams.
During that second set, Williams was given a warning from Ramos after the umpire determined her coach was attempting to instruct her using hand signals, which results in code violation. She denied the violation, saying to chair umpire Carlos Ramos that she'd rather lose than cheat.
Serena Williams was given a second violation, this one for smashing her racket, and again yelled at the chair umpire who had given her a first warning for coaching.
"I thought he took the game from me, other men said other things", said Williams, "I am here fighting for women's right and women's equality. I have a daughter and I stand for what's right for her", Williams told Ramos on the court.
"Osaka told ABC News Saturday evening that when Serena Williams hugged her at the end of the controversial match, it "really brought out the emotions" because when I was little and I was watching her play, I always wanted the opportunity to play her".
"But I've seen other men call other umpires several things". This is not fair.
"If it was men's match, this wouldn't happen like this".
The third violation - verbal abuse - came when she called the umpire a "thief", leading to an automatic game loss. "More voices are needed to do the same", she said. She believed that he had mistakenly labeled her a cheater by issuing the on-court coaching violation and wanted him to apologize for that.
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"I was coaching but I don't think she looked at me", Mouratoglou said. The nerves surfaced when the Japanese found herself trailing 0-40 in her second service game, but she managed to keep it together, battling back to deuce and saving another break point to hold and level the opener at 2-2. "Ramos had rescued his ego and, in the act, taken something from Williams and Osaka that they can never get back". But then when I hugged her at the net.
Just before the U.S. Open, the French tennis federation president said that the black catsuit worn this year by Williams at the French Open would not be allowed at that tournament in the future.
As a tense audience celebrated and jeered at Osaka's win, both women were wiping away their tears when Williams whispered something to Osaka and then embraced her.
The emotional Williams received applause from many in the room, and she didn't take further questions.
"I've never seen anything like it. Tennis was the loser and we lost what was potentially a fantastic match", Barker said. Williams lost 6-2, 6-4 to Osaka in Saturday's final.
'But you can not deny there have been a lot worse situations and I'm not going to name names.
2017 men's finalist Kevin Anderson urged Osaka to feel proud "for competing against someone you (and the rest of us) admire so much to win your first slam".