Coco Gauff has held off four-time major champion Naomi Osaka 6-4 6-4 to advance to the quarter-finals at the Silicon Valley Classic in California.
Gauff, the sixth seed, held all of her serves in the opening set on Thursday night and finished the 45-minute session with three aces.
The world No.11 raced out to at 5-1 and led 40-0 before Osaka, now raked 41st, saved four match points and her first ace made it 5-2.
Osaka then broke the 18-year-old for the first time in the match and overcame another 40-0 deficit with five straight points for 5-4. But Gauff closed it out on her eighth match point with an unreturnable serve.
"The most proud was how I responded mentally," Gauff said.
"I could have easily folded in those couple of double-faults and match points that I lost. But I kept telling myself 'another point, another chance' and then the music kind of helped on the bench. I was trying to sing along to the song to get me out of the match."
Gauff's victory evened the series with Osaka at two wins apiece and she'll face No.2 seed Paula Badosa in the last eight on Friday.
Elsewhere, Shelby Rogers and fourth seed Aryna Sabalenka were also victorious.
American Rogers beat top-seeded Maria Sakkari of Greece 6-1 6-3 to reach the quarters for the third time this season. Coming off an opening-round win against 2019 US Open champion Bianca Andreescu, she beat Sakkari, a 2018 finalist and 2019 semi-finalist in San Jose, for the third straight time.
Belarusian Sabalenka overcame 20 double-faults to beat local Caroline Dolehide 5-7 6-1 7-5 to advance to play No.7 seed Daria Kasatkina of Russia.
Australian Associated Press
