Marta Kostyuk of Ukraine capitalized on 39 unforced errors to oust No. 3 seed Coco Gauff 6-2, 7-5 in the second round of the Qatar TotalEnergies Open on Tuesday.

The 22-year-old unseeded Kostyuk won 58 percent of the total points, broke Gauff’s serve four times and benefited from seven double faults from the former U.S. Open champion.

Gauff had a chance to send the second set into a tiebreak as she served down 6-5. But two consecutive double faults gave Kostyuk two match points, the second of which she converted for the win.

“Coco is an incredible fighter,” Kostyuk said of Gauff during the on-court interview at the WTA 1000 event in Dota.

It was Kostyuk’s first win against Gauff in four tries on the hard courts.

“We always have incredible matches. I tried to stick to what I had to do,” Kostyuk said. “I’m very happy it worked out in two sets.”

Gauff, who hit just eight winners on Tuesday, had a first-round bye and now has lost three consecutive matches in Doha. She lost to Katerina Siniakova in her opening match last year and in the quarterfinals in 2023.

Another American, No. 6 seed Jessica Pegula, fared better in her match with a Ukrainian, defeating Elina Svitolina 6-3, 7-6 (3). In contrast to Gauff, Pegula tallied 39 winners in the two-hour match. She missed the Doha event last year due to injury but has three WTA 1000 wins in her career.

No. 4 seed Jasmine Paolini of Italy defeated France’s Caroline Garcia 6-3, 6-4, and No. 5 seed Elena Rybakina of Kazakhstan topped Peyton Stearns 6-2, 6-4 to move to the Round of 16 but other seeds had a rough time in early play Tuesday.

Ons Jabeur of Tunisia dropped No. 7 seed Qinwen Zheng of China 6-4, 6-2, breaking Zheng’s serve six times and winning 70 percent of her own first-serve points.

The No. 12 seed, Russian Mirra Andreeva, was eliminated by Rebecca Sramkova of Slovakia 3-6, 6-3, 7-5. Jelena Ostapenko of Latvia won a close one against No. 16 seed Liudmila Samsonova of Russia, who was done in, in part, by 10 double faults.

Other winners Tuesday included Belgium’s Elise Mertens, Czech Linda Noskova and former Grand Slam winner Sofia Kenin.

–Field Level Media