Rohan Bopanna and his Pakistani partner Aisam-ul-Qureshi stunned fourth seeds Igor Kunitsyn and Dmitry Tursunov in the opening round to advance to the quarter-finals of Indianapolis Tennis Championships.
The unseeded Indo-Pakistani pair beat their Russian rivals 2-6, 7-5, 10-6.
Bopanna and Qureshi, who finished runners-up in last week's Hall of Fame Tennis Championships in Newport, will face the Australian-American pair of Ashley Fisher and Tripp Phillips in the last eight.
Fisher and Phillips beat Frenchmen Nicolas Mahut and Giles Simon in their opening round match.
