Bopanna and Qureshi triumphed 6-1 7-6 (5) over the Serbs yesterday to set up a clash with the Spanish-Canadian combination of Feliciano Lopez and Milos Raonic.
The Indo-Pak pair, which upstaged third seeds Leander Paes and Mahesh Bhupathi in the previous match, raced away with the opening set very easily after breaking Djokovic and Troicki twice.
But the second set was stiffly-contested. Both the teams held serves, failing to convert any of the break chances they earned.
The issue was settled in the tie breaker in which Bopanna and Qureshi held their nerves to emerge triumphant.
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