British number one Johanna Konta reached the Rogers Cup quarter-finals with a 6-3 6-2 win over American Varvara Lepchenko in Montreal.
The world number 14, who claimed her first WTA Tour title in California on Sunday, won in 67 minutes.
Konta, 25, will face Kristina Kucova, 26, for a place in the semi-finals, after the Slovak beat Montreal-born Eugenie Bouchard 3-6 6-4 6-3.
World number six Venus Williams lost to fellow American Madison Keys.
Williams, 36, who was beaten by Konta in the final of the Stanford Classic at the weekend, went down 6-1 6-7 (2-7) 6-3.