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Coco Gauff reaches Australian Open semifinals with wild win

Coco Gauff's streak of 19 service holds was snapped. Her run of 11 consecutive sets won ended. She committed three times as many unforced errors as winners.

She advanced.

The No. 4 seed Gauff dodged 37th-ranked Marta Kostyuk of Ukraine 7-6 (6), 6-7 (3), 6-2 in the Australian Open quarterfinals. At 3 hours, 8 minutes, it was the longest Grand Slam match of the 19-year-old's career, according to Tennis Abstract.

She'll face a seed for the first time in Thursday's semifinals — No. 2 Aryna Sabalenka of Belarus or ninth-seeded Czech Barbora Krejcikova.

AUSTRALIAN OPEN DRAWS: Women | Men

Gauff is up to 10 consecutive match wins to start the season and 12 consecutive Grand Slam match wins when including her run to the U.S. Open title in September.

But Tuesday's victory stood out. In a 76-minute first set, Gauff went down 1-5, won the next five games to serve for the set, then was broken to go into a tiebreak.

Before the tiebreak, Kostyuk took a medical timeout for what appeared to be a blister on her big toe. In the tiebreak, Kostyuk squandered her second set point — 34 minutes after her first — and then Gauff won the next three points to end it.

Gauff won the set with five winners and 24 unforced errors.

Gauff served for the second set, too, and again was broken, then dropped the first four points of the tiebreak.

Kostyuk wilted in the third set. Gauff bolted to a 5-0 lead with just one winner. On her fourth attempt at serving out a set in this match, she succeeded.

Sabalenka is the only woman to not drop a set at the Australian Open so far. She plays Krejcikova later Tuesday. Gauff and Sabalenka are the only top-eight seeds remaining in the women's draw.

Gauff came from a set down to beat Sabalenka in the U.S. Open final, becoming the first U.S. teen to win a Slam since the first of Serena Williams' 23 titles at the 1999 U.S. Open.

Later Tuesday in the first men's quarterfinals, Novak Djokovic plays 12th-seeded American Taylor Fritz and No. 4 Jannik Sinner of Italy plays No. 5 Andrey Rublev of Russia.