Americans Gauff, Tiafoe, Nakashima and Pegula reach the semifinal round at Cincinnati Open

Frances Tiafoe and Brandon Nakashima won quarterfinal matches Friday night to set up one all-American men’s semifinal at the Cincinnati Open

MASON, Ohio -- Frances Tiafoe and Brandon Nakashima won quarterfinal matches Friday night to set up one all-American men's semifinal at the Cincinnati Open. Coco Gauff and Jessica Pegula also advanced to make it four U.S. players in the semis.

“It's insane, I think we're all doing so well,” Gauff said. “Hopefully, you know, we can have a double title win. Obviously there are more matches to be played for that to happen. We definitely root for each other.”

Tiafoe beat Italian Lorenzo Musetti, 7-6 (2), 7-5, and Nakashima beat fellow American Taylor Fritz, 7-6, 4-6, 6-3, marking the first time two Americans have reached the men's semifinals in Cincinnati since Andy Roddick and Mardy Fish in 2010.

Nakashima is the first American man to reach the semifinals in Canada and Cincinnati in the same season since Fish in 2011. Nakashima is coached by Tiafoe's former coach, Wayne Ferreira.

“It's a guy who knows me pretty well in Wayne," Tiafoe said. “I expect some good serving and all the best from him. Happy where I've been mentally more than anything. This has been a great week."

Tiafoe reached the Cincinnati finals in 2024, losing to Jannik Sinner.

The other men's semifinal Saturday features Italy’s Flavio Cobolli against Frenchman Arthur Fils.

Gauff beat Ukraine's Marta Kostyuk, 6-2, 6-2. Gauff will face surprise entrant 20-year-old Czech Sara Bejlek on Saturday.

Bejlek outlasted 2019 champion Madison Keys, 3-6, 6-4, 7-6 (5) on Friday. She upset No. 1-ranked Aryna Sabalenka in straight sets in the Round of 16.

“Sara is a great player," Gauff said. “I watched her a lot in Abu Dhabi (in February) this year when she won that title. So I think it's going to be a tough match. I'm looking forward to it.”

Pegula, ranked No. 3 and who beat Amanda Anisimova on Thursday, will face fifth-ranked Iga Swiatek in Saturday's other semifinal.