The defeat further dents Aisam's chances of making a return to the top-10 as he strives to seal a place at this year's London Olympics.
Meanwhile, world number two Rafael Nadal cruised through to the last-16 in the singles event, beating Czech Radek Stepanek 6-2, 6-2 in a third-round match, while fourth-seeded Andy Murray advanced when Canadian Milos Raonic withdrew with a right ankle injury.
"I'm just happy to be in the fourth round," said Nadal. "I will just try to keep doing well and try to keep improving."
In the women's draw, wild-card Venus Williams beat Aleksandra Wozniak of Canada 4-6, 6-4, 7-6 (7/5) and top-seed Victoria Azarenka powered past Heather Watson 6-0, 6-2 in third-round matches.
Published in The Express Tribune, March 27th, 2012.
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