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Naomi Osaka serves to Madison Keys during their 2018 U.S. Open women's singles semi-finals tennis match on September 6, 2018, in NY.

But her opponent, Serena Willams, and tennis fans alike were left wondering what was going on after a freakish circumstances cost Williams a game in the second set of Osaka's 6-2, 6-4 win.

Williams continued to exchange words with Ramos and then called him a "thief" which resulted in another violation for verbal abuse and meant Osaka was awarded a game.

Williams tearfully demanded an apology from chair umpire Carlos Ramos when the penalty against Williams gave a game to Osaka. "He said, 'I understood what you are saying, '" Williams explained after the match.

There was a lot more controversy than in a typical championship match, however, as Williams was first penalized a point and then a game for accumulating three violations.

"He (Ramos) alleged that I was cheating, and I wasn't cheating", said Williams. "And I think that's where we saw that emotion, and again men have gotten away with that forever in tennis", Brennan said.

Williams suffered life-threatening complications after the birth on September 1 of a year ago, requiring four surgeries to deal with blood clots. I just feel like not only is my future bright, even though I'm not a spring chicken, but I still have a very, very bright future.

"Congratulations to both Naomi and Serena for reaching the final at the 50th anniversary of the US Open and to Naomi for winning her first Grand Slam title". "Even when I was a little kid, I always dreamed that I would play Serena in a final of a Grand Slam. I'm not a Serena fan-I'm just a tennis player playing another tennis player", Osaka said.

It was that way throughout the tournament for Osaka, who won the second title of her career. In frustration, she smashed her racket, drawing a code violation for racket abuse-a point penalty after the earlier warning for coaching.

The 36-year-old Williams took umbrage with the statement, insisting that her coach simply gave her a thumbs up as a sign of support and encouragement.

"The thing is, like, I don't know what happened on the court. I don't really see what would change", said Osaka, who has long looked up to Williams. At the ripe age of 20, she derailed Williams' bid to tie Margaret Court's all-time record of 24 Grand Slam titles.

Another chance came and went in the eighth game and, although Keys was now serving superbly, she just could not find a way through.

The penalties helped 20-year-old Naomi Osaka pull off an improbable upset of one of the dominant players in women's tennis history.

What was most problematic for Williams on the scoreboard was that she was unable to keep up with a version of herself. Honestly, there's a lot I can learn from her from this match.

Osaka, the first Japanese woman ever to make a slam singles final, saved all 13 break points she faced, and, asked how she did it, replied: "This is going to sound really bad but I was just thinking I really want to play Serena". And ultimately, sad for Osaka, who played the match of her life and earned the victory. Osaka, meanwhile, became the youngest U.S. Open women's finalist since Wozniacki in '09 and the youngest victor since Maria Sharapova in '06.