In the biggest upset of the Australian open Tennis, World No.2 Novak Djkovic of Serbia has been ousted by Dennis Istomin of Uzbekistan. Istomin, ranked 117 in the world, beat Djkovic in a thrilling five setter 7-6, 5-7,2-6,7-6, 6-4 in a second round match today. Earlier Leander Paes and his Brazilian partner Andre Sa lost in the first round of the men's doubles today. The duo lost the match 4-6,7-6, 6-4 to 10th seeds Treat Huey and Max Mirnyi. Another Indian pair of Purav Raja and Divij Sharan also lost their first round match. They were beaten by the French pair of Jonathan Eysseric and Fabrice Martin in a hard fought match 7-6, 7-6 . Yesterday, Sania Mirza and Rohan Bopanna made winning starts to their respective campaigns with their doubles partners in Melbourne.Sania Mirza and Czech Republic's Barbora Strycova recorded a resounding 6-3 6-1 win over the British pair of Jocelyn Rae and Anna Smith in the women's doubles event.Bopanna and his Pablo Cuevas from Uruguay, seeded 15th, pipped Thomaz Bellucci from Brazil and Maximo Gonzalez from Argentina 6-4 7-6(4) in the men's doubles first round. Their next opponents are Australia's Alex Bolt and Bradley Mousley.