Sania Mirza and Bethanie Mattek survived a tough test to secure a quarterfinals berth of the USD 2,100,000 Pacific Life Open at Indian Wells, California, in the United States.
Sania and USA's Mattek, seeded seventh in the draw, defeated Tatiana Poutchek of Belarus and Russian Anastasia Rodionova 6-2, 4-6, 10-7 to advance to the last eight.
Meanwhile, Sania will face her former doubles partner Shahar Peer in the third round of the singles competition after the ninth seeded Israeli prevailed over Uzbekistan's Akgul Amanmuradova 6-1, 6-4.
Sania is seeded 21 in singles in the Tier I event.
In the USD 3,589,000 men's Masters Series event being held at the same venue, Leander Paes and Australian Paul Hanley, seeded eighth, will take on the Argentine combination of David Nalbandian and Gullermo Canas in the second round.
Sixth seeded Mahesh Bhupathi and Mark Knowles of Bahamas will start their campaign against German Christopher Kas and Rogier Wassen of the Netherlands.