Lexington (US), Aug 13 (AP) American teenager Coco Gauff overcame some shaky serving Wednesday to beat No. 2 seed Aryna Sabalenka 7-6 (2), 4-6, 6-4 and reach the Top Seed Open quarterfinals with her third career victory over a top-15 opponent.

The 16-year-old Gauff hit 10 double-faults and was broken seven times.

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“I guess,” she said afterward, “everything was an 'A' but the serving.” She was able to hang in there with steady baseline play against the hard-hitting Sabalenka, who had 14 double-faults, including four in one game.

It was a topsy-turvy match that lasted nearly three hours and featured a bit of confusion when Gauff and her father, Cori, got into a discussion with the chair umpire about what sort of coaching is allowed under adjusted rules the WTA put in place recently.

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Of more concern to Gauff was the way she was starting off points in her service games. At one point, she implored herself: “I've got to make the first serves. Come on.”

Gauff's plan after dropping the second set? “Just to stay calm and composed,” she said in an on-court TV interview afterward, “and making her play balls.” That worked.

Sabalenka is ranked 11th, behind only No. 9 Serena Williams among the women entered in the hard-court tournament that is the first professional tennis event in the United States since the start of the coronavirus pandemic. Gauff is No. 53 but should now return inside the top 50.

Next up for her is a match Friday against No. 8 seed Ons Jabeur, who produced 10 aces while eliminating Olga Govortsova 3-6, 6-2, 6-4. Govortsova had been seeking her first WTA quarterfinal since 2014.

The other quarterfinal on that side of the draw will be Marie Bouzkova against Jennifer Brady, who beat No. 6 seed Magda Linette 6-2, 6-3 in Wednesday's last match. Bouzkova followed up her upset of No. 3 Johanna Konta in the first round by defeating Anna Blinkova 6-4, 6-2 on Wednesday.

Thursday's second-round action will include the 31st career matchup between Williams and her older sister, Venus. AP

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