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Novak Djokovic has beaten fellow Serb Viktor Troicki 6-1 6-4 in the Dubai Championships first round as the world No 1 extended his unbeaten run to 14 matches.
Also into the second round is former US Open champion Juan Martin Del Potro, who saved three match points on his way to beating Marcos Baghdatis 4-6 6-4 7-6.
Michael Llodra beat a tiring Jo-Wilfried Tsonga 7-6 6-2, his first victory in seven meetings against his fellow Frenchman.
Third seed Tomas Berdych of the Czech Republic strolled past wildcard Rajeev Ram 6-1 6-3.
Rafael Nadal needed just over an hour to beat Diego Schwartzman of Argentina 6-2, 6-2 to advance to the second round of the clay court Mexican Open.
The seven-time French Open winner is making a comeback after being away from the tour for more than seven months with a
left-knee injury.
He beat David Nalbandian for the Brazil Open title earlier this month.
