Swiss number one Roger Federer kept a cool head in the heat of Dubai on Wednesday, easing past Romania's Andrea Voinea in straight sets.

After winning last weekend's ATP doubles tournament on the indoor courts of Rotterdam, Federer showed no difficulty in adapting his game to the outdoor hardcourts of Dubai.

The Swiss star's 6-3, 6-4 victory owed more than a little to the temperament of his opponent, however. Having seen his service broken late in the opening set, Voinea (ATP 38) expended a good deal of energy during the second set on criticising line calls.

"Voinea certainly made my victory easier by losing his composure," Federer (ATP 14) said afterwards.

The Basel player is now set to meet Germany's Rainer Schüttler in the tournament's second round. Having beaten Schüttler (ATP 40) in all three of their previous meetings, the Swiss will be the clear favourite to reach the quarter-finals.

swissinfo with agencies

In compliance with the JTI standards

More: SWI swissinfo.ch certified by the Journalism Trust Initiative