GSTAAD, Switzerland, July 10 (UPI) -- Fifth-seeded Frenchman Paul-Henri Mathieu was among Tuesday's first-round winners at the rain-plagued Swiss Open tennis tournament.
Mathieu defeated Argentine Sergio Roitman 7-6 (7-4), 6-4 and next will face last year's Swiss Open runner-up Feliciano Lopez.
Eight matches were either suspended or postponed because of wet weather Tuesday. Inclement weather also prevented several matches from being completed or started Monday.
Two other seeds won Tuesday as sixth-seed Frenchman Marc Gicquel beat Argentine Diego Hartfield 6-3, 7-6 (7-5) and eighth-seed Italian Potito Starace beat Czech Jan Hajek 7-6 (7-4), 6-1.
Four other seeds, including top-seeded Russian Nikolay Davydenko and reigning Swiss Open champion Richard Gasquet, had their openers pushed back until Wednesday.
Davydenko was tied with Frenchman Gael Monfils 6-3, 4-6, 5-5 when play was halted for the day.