Keys beats Rybakina in Cincinnati to set up semi-final with Kvitova

American Madison Keys swept past Wimbledon champion Elena Rybakina 6-2 6-4 at the Cincinnati Open, setting up a semi-final clash with Petra Kvitova.

Having dispatched world number one Iga Swiatek in the third round, the 27-year-old Keys carried that momentum into the quarter-finals with a dominating win over 25th-ranked Rybakina.

Both Keys and Rybakina had reached the last eight without dropping a set and it would be the American keeping the unblemished record.

"I knew she is a remarkable player and she can turn it around at any moment so I knew I had to try to stay out in front because at any moment she can go on a roll," said Keys, finalist at the 2017 US Open.

"I think that is kind of the key against her. If you back off at all then she gets to dictate and run you around."

One of the WTA Tour's big-hitters, ranking number two on the season ace list, Rybakina struggled with her serve the entire match, hitting just one ace while piling up four double faults.

In the first contest on a muggy Centre Court, Keys, Cincinnati champion in 2019, got out to a flying start breaking Rybakina twice on the way to a 4-0 lead before the Kazakhstan player was finally able to hold serve.

After surrendering the opener Rybakina rallied in the second with an early break to jump out in front 2-0.

But Keys dug in, sweeping the next five games to retake control 5-2 and after a late wobble closed out the contest on her fourth match point when Rybakina hit her return into the net.

Later, twice Wimbledon champion Kvitova reached the last four in Cincinnati for the third time in her career with a business-like 6-2 6-3 victory over Australian qualifier Ajla Tomljanovic

The other semi-final will see the only remaining seed number six Aryna Sabalenka take on French qualifier Caroline Garcia, who continued her upset run through the draw with 6-1 7-5 win over seventh seeded American Jessica Pegula.

Belarusian Sabalenka, who finished last season as the world's number two ranked player, advanced with a 6-4 7-6(1) decision over China's Zhang Shuai.