Gauff, the sixth seed, kept all of her serves in the first set and finished the 45-minute round with three aces.

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Osaka made the first double foul of the match early in the second set and Gauff took advantage of the opportunity to take a 2-1 lead.

Gauff quickly scored a brace 5-1 and took a 40-0 lead before Osaka saved four points and used their first ace to make it 5-2.

Osaka then beat Gauff for the first time in the game and weathered another 40-0 loss by 5 in a row at 5-4. But Gauff ended it on his eighth match point with an unhandled serve.

"The thing I'm most proud of is how I reacted mentally," Gauff said. “I was able to easily fold in those two double errors and the matches that I lost.

But I kept saying to myself "Another point, another chance" and then the genre of music got me on the bench. I tried singing the song to get me out of the game.

Gauff's win tied Osaka's streak with two wins each. "I lost the match today but I feel really confident in who I am,"

 Osaka said. "I feel like pressure can't beat me. I'm pressure. I'm really happy about it."

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Gauff will face No. 2 seed Paula Badosa on Friday. The other winners in San Jose were Shelby Rogers and fourth seed Aryna Sabalenka.

After her first-round win over 2019 US Open champion Bianca Andreescu, she defeated Sakkari, 2018 finalist and 2019 semi-finalist in San Jose, for the third time in a row.

Sabalenka was back after leading 5-3 in the third set against Caroline Dolehide 5-7, 6-1, 7-5. Sabalenka overcame 20 double errors match to qualify against 7th seed Daria of Russia

Friday's schedule for the US Open on hard courts includes Wimbledon runner-up Ons Jabeur, who will face Veronika Kudermetova.

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