Kostyuk's run in Austin has earned her a place in the world's top-40 for the first time in her career.
Just a six-hour drive south of Austin, in Monterrey, Mexico, Croatian Donna Vekic clinched her fourth career title with a statement win over reigning WTA Finals champion Caroline Garcia.
Vekic's 6-4, 3-6, 7-5 result against Garcia was her sixth triumph over a top-five opponent. She fired 13 aces against the Frenchwoman and saved a remarkable 14 of 16 break points.
"It’s been a great start of the year for me. If the title didn’t come now, I believe that it would have come soon," said Vekic, who made the Australian Open quarter-finals in January and is now up to No.23 in the rankings, her highest mark since February 2020.
"So I’ve been playing good tennis, and I just need to keep working hard and hopefully stay healthy, and I’m sure I will keep having good results."