Top seed Sania Mirza quelled a late challenge from American wildcard Laura Granville to enter the quarter-finals of the US $75,000 ITF Vancuover Open on Thursday.
Competing in only the third ITF event of her career, the Indian ace defeated Granville 6-2, 7-5.
Sania will take on local favourite Rebecca Marino in the last-eight stage.
Rebecca stunned eighth seed Australian Olivia Rogowska 7-5, 7-6(0) to make the quarter-finals.