Sania Mirza and Leander Paes carved out contrasting wins with different partners to reach the mixed doubles quarterfinals at the Australian Open tennis tournament in Melbourne today.Top seeds Sania and her Brazilian partner Bruno Soares edged past Abigail Spears and Santiago Gonzalez 7-5, 6-7,10-8 while seventh seeds Paes and Martina Hingis out played the Spanish combine of Anabel Medina Garrigues and Pablo Andujar 6-3, 6-1.There were also cheers for India in the junior boys singles section as Sumit Nagal humbled Yosuke Watanuki of Japan 6-2 6-3 in the second round encounter.