Gaston Gaudio remained perfect when he gets the chance to win a tournament.

The second-seeded Gaudio posted a 6-4 6-4 victory over Romanian qualifier Stanislas Wawrinka in the final of the US$503,000 Allianz Suisse Open on Sunday.

Winner of his fourth claycourt event this year, the Argentinian Gaudio improved to 4-0 when he reaches the final of an event.

The 2004 French Open champion upped his record to 34-7 on clay this year.

The 20-year-old Wawrinka was in a final here for the second straight year. In 2004, he was a doubles finalist in this event.

Last year's winner, world number one Roger Federer of Switzerland, skipped the event after claiming a third straight Wimbledon title.