BUENOS AIRES, Argentina (AP) -- No. 5-seeded Leonardo Mayer of Argentina reached the second round of the Argentina Open on Monday, defeating Stephane Robert of France 6-0, 6-1.
In another first-round match between unseeded players, Paolo Lorenzi defeated Thomaz Bellucci of Brazil 6-4, 6-7 (5), 6-1.
Rafael Nadal is the No. 1 seed. He plays Wednesday and has a bye into the second round of the clay-court event. The other three seeded players also have byes: No. 2 Tommy Robredo, No. 3 Pablo Cuevas and No. 4 Fabio Fognini.
Nadal was beaten by Fognini in the semifinals of last week's Rio Open. It ended his 52-match unbeaten string in semifinals on clay. The former No. 1 has yet to reach a final this season in three tournaments, trying to rebound from illness and injury.
''Physically I am a little worse off than I would like to be,'' Nadal said, talking about last week in Rio. ''I'm missing things - being a little more confident in my physical side, which I have been my entire career. I need to be more consistent on the court. I think this has been the most important thing in my career.''
Nadal said what he said last week in Rio: be patient and keep grinding.
''This is a phase I have to get through,'' Nadal said. ''I have to work for it.''