Pakistam's Aisam-ul Haq Qureshi and his Indian partner Rohan Bopnna stunned pair of Uzbekistan's Istomin and Kazakhstan's Andrey Golubev to reach the semi final of the Pilot Pen tournament here. The duo won by 6-3, 7-6 (1). On Wednesday, the unseeded Indo-Pak pair scored a 6-3, 2-6, 10-5 win to secure a quarter-final berth in the doubles event of the $ 663,750 hard court event, a part of US Open series tournaments. The pair would meet India's Mahesh Bhupathi and Belarus' Max Mirnyi in the semis.