India's Mahesh Bhupathi and his Russian partner Nadia Petrova entered the pre-quarterfinals of the Mixed Doubles event at the Australian Open Tennis on Sunday. The fifth seeded Indo-Russian pair defeated Jean-Julien Rojer of the Netherlands and his Aussie partner Anastasia Rodionova, 6-4 6-2 in their opening round match.Bhupathi joined three more compatriots in the Mixed Doubles pre-quarter finals. India's Sania Mirza, Leander Paes and Rohan Bopanna, with their respective partners, have already advanced into the next round in this category. Apart from the mixed doubles, Bhupati has also made it to the pre-quarters in the men's doubles.In the women's singles, Maria Sharapova set a new Australian Open record in losing just five games en route to the quarter-finals. The second seeded Russian defeated unseeded Belgian Kirsten Flipkens 6-1, 6-0 on Sunday. She will meet compatriot Ekaterina Makarova in the next round. Li Na of China and Agnieszka Randwanska of Poland also made it to the.In Men's Singles, defending champion Novak Djokovic was stretched to five sets by Swiss Stainlas Warwinka.The Serb overcame Warwinka by 1-6, 7-5, 6-4, 6-7, 12-10 to enter the quarter-finals. David Ferrer, Nicolas Almagro of Spain and Thomas Berdych of Germany have made it to the quarter-finals.