Seeded players Gilles Simon of France, Fernando Verdasco of Spain and local favorite Juan Monaco were knocked out in the second round of the Copa Claro on Thursday.
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Carlos Berlocq of Argentina beat the third-seeded Simon 6-2, 6-1 and Igor Andreev of Russia downed No. 7 Verdasco 7-6 (3), 6-3 at the clay-court tournament.
Argentine David Nalbandian defeated No. 5 Monaco 6-3, 6-1.
One more seeded player was scheduled to be in action later Thursday with No. 2 Nicolas Almagro of Spain up against Federico Delbonis, another Argentine.
Nobody was better on clay on Thursday than the former Wimbledon finalist Nalbandian, who made few errors.
”I played a great match with lots of intensity from the start,” Nalbandian said. ”Unfortunately, I don’t think Juan (Monaco) had his best day. This is a tournament that all Argentines like to play.”
Nalbandian will face fellow Argentine Berlocq in Friday’s quarterfinals. In other quarterfinal matchups it will be top-seeded David Ferrer of Spain against Chile’s Fernando Gonzalez, and No. 4 Kei Nishikori of Japan facing No. 6 Stanislas Wawrinka of Switzerland. Andreev will face Almagro.