PTI
 
Melbourne, Jan 23: An upset second round win followed by a walkover in the quarterfinals ensured Mahesh Bhupathi and Sania Mirza a berth in the last four of the mixed doubles event at the Australian Open here on Tuesday.

The unseeded Indian team quelled the challenge of Simon Aspelin and Lisa Raymond, seeded second in the event, 6-3, 2-6, 10-7 before benefitting from a walkover given by seventh seeded Czechs Martin Damm and Kveta Peschke.

In the boys' singles, Yuki Bhambri kept the Indian flag flying by advancing to the third round while curtains were drawn on Karunuday Singh's campaign.

The eighth seeded Bhambri rallied to beat Slovakia's Zalan Klempa 3-6, 6-4, 6-2 in his second round match and will take on Japanese Tadayuki Loughi in the pre-quarterfinals.

Karunuday went down fighting 6-7 (4-7), 4-6 against Tsung-Hua-Yang of Chinese Taipei in the same round.

Sixth seeded Bhupathi and Mark Knowles of Bahamas would take on top seeded pair of Mike Bryan and Bob Bryan in the men's doubles quarterfinals on Wednesday.