India's Sania Mirza, who upset former world number one Martina Hingis on Tuesday, advanced in the doubles draw as well at the East West Bank Classic in Los Angeles on Wednesday evening.
Sania and American partner Bethanie Mattek faced a tough opening challenge, before they prevailed 6-3, 2-6, 11-9 over Slovakia's Janette Husarova and Dutchwoman Michaella Krajicek.
The Indo-American duo will face second seeds Rannae Stubbs and Kveta Peschke in the quarter-finals.
In singles, Sania will play France's Virginie Razzano in the third round.
Razzano beat tenth seed Shahar Peer of Israel 6-1, 4-6, 7-6(6) in the second round on Wednesday.