Sania Mirza and her Zimbabwean team-mate Cara Black today progressed into the quarterfinals of the Australian Open Tennis tournament at Melbourne. The sixth seeded Indo-Zimbabwean duo defeated the Canadian-Russian team of Eugenie Bouchard and Vera Dushevina, 6-4, 6-3. For a place in the semi-finals, Sania and Cara will take on the top seeded Italian pair of Sara Errani and Roberta Vinci.In the Mixed Doubles, second seeds Rohan Bopanna and his Slovakian partner Katarina Srebotnik defeated the Aussie pair of John Peers and Ashleigh Barty, 7-6, 7-5, to book a quarterfinal berth. In the second round today, the Indo-Slovakian pair of Leander Paes and Daniela Hantuchova will clash with the pair of Mahesh Bhupathi and Russia's Elena Vesnina, while Sania Mirza and her Romanian team-mate Horia Tecau will meet the Aussie-British combination of Anastasia Rodionova and Colin Fleming. Earlier today, World Number Three Maria Sharapova made a shock exit from this first Grand Slam of the season. Sharapova lost to Slovakia's Dominika Cibulkova, 6-3, 4-6, 1-6. This is the second major upset of the tournament. World Number One Serena Williams had yesterday crashed out in the fourth round, after losing to Serbia's Ana Ivanovic. World Number Two Victoria Azarenka of Belarus today made it to the last-eight stage.