Top-seeded Russian Nikolay Davydenko and Austrian crowd favorite Jurgen Melzer were among Monday's first-round winners at the St. Polten International tennis event, a final tuneup for the French Open. The 2003 St. Polten runner-up Davydenko handled Slovakian Michal Mertinak 6-3, 6-2, while the fourth-seeded Melzer mauled fellow Austrian Marco Mirnegg 6-3, 6-1. Davydenko's second-round opponent will be veteran Dutchman Sjeng Schalken, while Melzer will face fellow lefthander, Luxembourg's Gilles Muller. The day's lone upset occurred when Argentine clay-courter Jose Acasuso erased third-seeded Russian Igor Andreev 3-6, 6-3, 6-2. Fifth-seeded Argentine Mariano Puerta dismissed Spaniard Alex Calatrava 7-5, 6-2, while seventh-seeded Italian Potito Starace stopped German Philipp Kohlschreiber 6-3, 7-6 (7-2). Other Day-2 wins came for Spaniards Felix Mantilla, Nicolas Almagro, David Sanchez and Guillermo Garcia-Lopez, and the aforementioned Muller. Mantilla reached the final here in 1996.