Defending champion Aryna Sabalenka was eliminated from the Cincinnati Open after a 6-1, 6-4 defeat to Elena Rybakina in the quarterfinals Friday.
Rybakina was dominant in the opening set and served 11 aces as she wrapped up an impressive win in 1 hour, 14 minutes.
The victory continues Rybakina's return to form after her semifinal appearance at the National Bank Open in Toronto.
The 2022 Wimbledon winner will meet Iga Swiatek in the semifinals after she beat Anna Kalinskaya 6-3, 6-4.
Carlos Alcaraz fought off a spirited Andrey Rublev to book his spot in the semifinals with a 6-3, 4-6, 7-5 win.
After Rublev fought back in the second set, it finally looked like Alcaraz would seal the victory when he broke Rublev to go 5-3 up in the third. But Rublev broke back.
Rublev needed to hold serve to take the game to a tiebreak, but a critical double fault clinched Alcaraz's victory.
Alcaraz, 22, hit 11 aces in the victory and will next face third-seeded Alexander Zverev, who knocked out fifth-seeded American Ben Shelton 6-2, 6-2.
Elsewhere, Veronika Kudermetova earned a 6-1, 6-2 win over Varvara Gracheva to set up a clash with Jasmine Paolini, who defeated Coco Gauff 2-6, 6-4, 6-3.
Information from Press Association was used in this report.