Coming up next for Bencic will be Vekic, the 23rd seed of the tournament. She saved a match point in the second set and made her first Slam quarterfinal by rallying past Julia Goerges from Germany 6-7(5), 7-5, 6-3.

Bencic owns a 2-1 career edge over Vekic from two 2017 wins but Vekic won the most recent meeting with her friend and frequent practice partner in the third round of this year's French Open.

"It's going to be a tough match for sure," Vekic said. "She's one of the best players this year."

Elsewhere, the 25th-seeded Mertens dropped just two games against American wildcard Kristie Ahn to reach the US Open quarterfinals for the first time.

During the 6-1, 6-1 demolition, Mertens fired 17 winners to Ahn's nine and kept her unforced errors in check -- 15 to her opponent's 25. The Belgian star stayed in command during the big points and saved all three break points she faced.

"I'm just trying to focus every time I step on the court, just trying to look point per point," Mertens said. "I was trying to play aggressive, trying to improve myself. That's probably the main key. Just try to focus throughout the whole match."

"I thought she played very smart. She had a game plan, and she executed it very well," Ahn said of the match. "I think it had to do with her kind of breaking my rhythm or not allowing me to have rhythm. I don't think she allowed me to see the same ball twice."

Mertens will take on Canadian player Bianca Andreescu in the quarterfinals. Andreescu defeated American qualifier Taylor Townsend 6-1, 4-6, 6-2.

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