GSTAAD, Switzerland (AP) _ Gaston Gaudio of Argentina upset third-seeded Juan Carlos Ferrero of Spain in straight sets Wednesday at the rain-soaked $600,000 Swiss Open.

Gaudio, ranked 42nd, won 6-4, 7-6 (3) against the French Open semifinalist to advance to the second round.

Defending champion Albert Costa, seeded fourth, beat Austria's Stefan Koubek 4-6, 6-3, 6-3. Second-seeded Nicolas Kiefer of Germany defeated Spanish qualifier Alex Calatrava 6-3, 7-6 (7-2).

Also, Jerome Golmard downed qualifier Nicolas Thomann 4-6, 6-2, 6-4 in an all-French match.

Just seven of the 16 first-round matches have been completed. With play backed up almost two days and with only four courts at their disposal, organizers had hoped to play 14 singles and eight doubles matches on the day, borrowing an extra two courts from the nearby Palace Hotel.

Rain washed out the opening day Monday and allowed only two matches on Tuesday. Similar weather is forecast for Thursday and Friday.

Gaudio broke Ferrero's opening serve, then held his own throughout for the set.

Ferrero had a chance in the second set, converting his only break point of the match to take a 3-0 lead. But even down 4-2, Gaudio refused to be intimidated. He broke to go up 4-3 and held serve to force the tiebreak. The Argentine then won the first five points.