6-2, 6-4 over Magada Linette to advance to the third round.
Osaka, just 21-years old until October, probably thought that she would have some time as the young, exciting new face of her sport as she won the 2018 U.S. Open and the 2019 Australian Open.
Another young American woman made some noise, too: Taylor Townsend, 23, whose pure, raw emotion came through after she delivered one last crisp forehand volley to complete her 2-6, 6-3, 7-6 (4) upset of two-time major champion Simona Halep.
The Spaniard improved his record here against players outside the top 50 to 35-1 and will meet 2014 champion Marin Cilic or top United States hope John Isner for a place in the quarter-finals. "Coco is much younger than Naomi if you could say that because Naomi is incredibly young".
In all tour-level main-draw matches, Williams is 97-107 after ceding the opening set, a.475 winning percentage that leads active players.
On the excitement Gauff has stirred, Williams added: "I think she's really pretty cool".
"Like I said, I'm here now", Townsend said. "You know there's going to be that electricity, because everyone's seeing the future for maybe the first time".
"In the fourth round, I have a tough opponent and need to be ready for this". Fifteen year-olds have long since won matches at the US Open, but with the age demographics rising across the elite game only two have previously done it in the last 22 years.
The only other active player with more than 25 such victories is her older sister, Venus, who has 28.
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Following her victory in a brutal battle with Timea Babos on Thursday, John McEnroe was quick to warn how a Gauff triumph in the match everyone hoped to see may be too much, too soon for the 15-year-old sensation. "I just tried to keep my head on straight".
Teenager Coco Gauff's impressive run at the U.S. Open has set up one of the most anticipated tennis matchups of the year in the third round. "I definitely am interested to watch". I think we're all just kind of pushing each other. Osaka blows hot and cold, capable of the sublime and occasional troughs in form; Gauff comes out in every game like a summer hailstorm, peppering the court with hefty groundstrokes on the back of a serve that is already one of the most powerful in the women's game.
Tennis fans are really pulling for Coco.
"She's super sweet - I would love to play her, " Osaka told the New York Post, referring to Gauff.
Gauff was trying to duplicate her thrilling run to the fourth round at Wimbledon but to do so would have to get past the No. 1 ranked player under the lights at Arthur Ashe Stadium, where Osaka beat Serena Williams in last year's final for her first major title.
"She said, 'Dad, you didn't give me a dime for college tuition, so why don't you support me for three years?"
"I made it up in my mind before I came". I think for some years I was lost, lost in a sea of a lot of stuff. It was a lot of love. My phone started dialing 9-1-1 by itself - I don't know what that was about. I just mean, like, I'm very quiet. "I had to dig really deep".
"I am here, we are going to ride this thing all the way", she pledged in an on-court interview.