India's Rohan Bopanna and Vijay Kannan were eliminated in the pre-quarter-finals of the Indian Oil Servo-ATP Challenger tennis tournament in Bangalore on Wednesday.

Fourth seed Ivo Heuberger of Switzerland overcame a stiff challenge from Bopanna, India's top singles player who got a wild-card to the tournament, before prevailing at 1-6, 7-6 (7-2), 7-5.

Kannan, who upset sixth seeded Bjorn Rehnquist of Sweden in the first round on Tuesday, also fell by the wayside, losing to Fred Hemmes Jr. of the Netherlands 3-6, 6-7 (6-8).

Meanwhile, second seed Gregory Carraz (France) advanced to the last eight, along with Louis Vosloo (South Africa) and Peter Wessels (The Netherlands).

Carraz beat Todor Enev of Bulgaria 6-3, 6-3, while Vosloo struggled in the second set before putting it across Austria's Alun Jones 6-2, 1-6, 6-1.

Wessels surprised the seventh seed from Finland Tuomas Ketola as he came from behind to win 4-6, 7-6 (7-5), 6-0.