Sania and Bopanna subdued Britain's Andy Murray and Heather Watson with remarkable ease to breeze into the mixed doubles semifinals with a 6-4 6-4 win in just 67 minutes.
One more victory will ensure India a silver medal and a defeat in the semifinals would give Sania and Bopanna a chance to fight for the bronze.
Sania and Bopanna were a better team than the Britons, who never posed a threat to the Indians. Bopanna was solid with his booming serve while Sania played superbly from the back of the court.
The 24-year-old Indian started off with some counter punches in a fast-paced round one in Pavilion 6 at Riocentro, and carried on the momentum throughout to emerge triumphant.
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Before that though, India did not have anything to cheer about.
The men's hockey team, already assured of a berth in the quarter finals, led twice against lowly Canada before allowing their rivals to bounce back and earn a 2-2 draw in their concluding pool game.
To add to the woes, the country's athletes made a disastrous beginning in track and field events with star discus thrower Vikas Gowda buckling under pressure once again to finish a distant 28th with a poor best throw of 58.99 metres and was eliminated.
The day commenced with Atanu Das letting slip chances in his men's individual recurve pre-quarterfinal to bow out of contention and draw curtains on India's fruitless campaign in archery.
The Indian lost 28-30, 30-28, 27-27, 27-28 28-28 to bring to an end the country's medal-less campaign.
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