SAN JOSE—Coco Gauff held off four-time major champion Naomi Osaka 6–4, 6–4 on Thursday night to advance to the quarterfinals at the Mubadala Silicon Valley Classic.
Gauff, the No. 6 seed, held all of her serves in the opening set and finished the 45-minute session with three aces. Osaka had the first double-fault of the match early in the second set and Gauff took advantage for a 2–1 lead.
Gauff quickly built a double-break lead at 5–1 and led 40–0 before Osaka saved four match points and used her first ace to make it 5–2.
Osaka then broke Gauff for the first time in the match and overcame another 40–0 deficit with five straight points for 5–4….