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The Associated Press
MELBOURNE, Australia -- Coco Gauff kept alive her hopes of back-to-back Grand Slam singles titles after beating Marta Kostyuk 7-6 (6), 6-7 (3), 6-2 in an error-strewn quarterfinal match at the Australian Open today.
The U.S. Open champion had 51 unforced errors, nine double faults and just 17 winners but battled past Kostyuk in 3 hours, 8 minutes.
The 19-year-old American has now won 12 straight matches in Grand Slams.
"I'm really proud of the fight I showed today," said Gauff, who plays either defending champion Aryna Sabalenka or ninth-ranked Barbora Krejcikova in the semis.
"Marta's a tough player, we always have close matches," Gauff added. "I really fought and left it all out on the court today. In the second set, I had an opportunity but I think I got passive. When I came out in the third I really tried to be a bit more aggressive."
Having lost just 15 games on her way to the quarters, Gauff was vulnerable early on against Kostyuk, the Ukrainian who was appearing in her first Grand Slam quarterfinal.
Men's No. 1 Novak Djokovic was in action later in the day, taking on No. 12 Taylor Fritz for a place in the semifinals.
On Monday, No. 2 Carlos Alcaraz, No. 2 Daniil Medvedev and No. 6 Alexander Zverev all advanced to the quarterfinals.