HUA HIN, Thailand — Ukrainian teenager Dayana Yastremska advanced to the semifinals at the Thailand Open by beating two-time major champion Garbine Muguruza 7-6 (5), 6-1 Friday.
The 18-year-old Yastremska also beat Muguruza last year in Luxembourg.
“I forgot about what happened last year as this is a different match,” Yastremska said. “I watched highlights (of Muguruza’s matches) to see how she played. Although I’m confident, but it was last year. I had to concentrate.”
In the tiebreaker, Yastremska jumped out to a 6-1 lead but struggled to finally win the first set. After Muguruza netted a forehand on the deciding point, the Spaniard smashed her racket on the court and received a code violation from the chair umpire.
Yastremska will next play Magda Linette of Poland, who defeated Wang Yafan 6-2, 6-3.
Also, sixth-seeded Ajla Tomljanovic of Australia beat fourth-seeded Saisai Zheng of China 6-1, 6-3 to reach the semifinals. She will next face Tamara Zidansek of Slovenia, who defeated Victorija Golubic of Switzerland 4-6, 6-1, 6-2.
DOHA, Qatar – Unseeded Elise Mertens came from a set and a break down to beat recent No. 1 Simona Halep 3-6, 6-4, 6-3 in the Qatar Open final and capture the biggest title of her career on Saturday.
Halep led 6-3, 2-0, then lost a service game for a third time to see the second set back on serve. Mertens continued to pressure, missing two more break chances in the seventh game but finally breaking – to love – in the ninth. The set was the first Mertens took from Halep in three matchups.
Mertens broke again to start the third set, Halep leveled at 2-2, but Mertens finished stronger and won her fifth career title.
The Belgian beat two other top-10 players this week, Kiki Bertens and Angelique Kerber.
Halep’s first final appearance since August guaranteed she will rise one spot to No. 2 in the rankings on Monday.
BUENOS AIRES, Argentina — Top-seeded defending champion Dominic Thiem of Austria advanced to the Argentina Open quarterfinals Thursday, beating Germany’s Maximilian Marterer 6-4, 6-4.
Thiem will face Uruguay’s Pablo Cuevas, a 6-4, 7-5 winner over Portugal’s Joao Sousa.
Fourth-seeded Diego Schwartzman of Argentina beat Slovenia’s Aljaz Bedene 6-4, 2-6, 6-2 to set up a match against Spain’s Albert Ramos-Vinolas. Ramos-Vinolas beat compatriot David Ferrer 3-6, 7-6 (9), 6-3.
Ferrer promised to retire in May at the Madrid Open. The participation in the Buenos Aires tournament is one of the last of the 36-year-old’s career.