British number one Johanna Konta reached the Western and Southern Open quarter-finals with a straight-set win over former champion Vera Zvonareva.
The eighth seed broke three times, with her own serve rarely under threat, to triumph in an hour and 21 minutes.
Konta will face American great Serena Williams or Greek 13th seed Maria Sakkari in the last eight.
That will represent a step up in class of opponent for the Briton, although Konta should not fear either player on the evidence of her two matches in this event.
Again she hit confidently and cleanly against 35-year-old Zvonareva, a two-time Grand Slam finalist who is trying to climb back up the rankings after taking time off tour to give birth in 2016.