After a tense one hour and 38 minutes, Zheng and Mirza edged out Grandin-Jurak 2-1 in the tiebreaker to win the match, and end the see-saw encounter.

The pair started off the first set strong and quickly took the lead. But Grandin, with swift and strong ground-strokes, overtook Zheng and Mirza to make a comeback — first tying the game at 4-4, and then ultimately winning the set playing aggressively.

Zheng and Mirza have had relatively little experience working together. They partnered up for the first time this May at the Brussels Open where they went up to the semi-finals.

Mirza and Zheng will be facing the winner of the Eugenie Bouchard-Kirsten Flipkens, and Oksana Kalashnikova-Alicja Rosolska encounter.u00a0

Defending champion Novak Djokovic cruised to victory on Tuesday night in his first match since finishing runner-up at Wimbledon, defeating Florian Mayer 6-2, 6-1 in the second round of the ATP Rogers Cup. The top seed needed just 55 minutes to see off his opponent.

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Thirteenth seed Kirsten Flipkens battled back to snatch victory from the jaws of defeat against former World No 1 Venus Williams in the first round of the WTA Rogers Cup in Toronto on Tuesday.u00a0Seven-time grand slam singles winner Williams stormed through the first set without losing a game and had two break points to go 5-4 up in the second, but an inspired Flipkens turned things around to triumph 0-6 6-4 6-2.u00a0