ROTTERDAM, Netherlands -- Second-seeded Tommy Robredo and third-seeded Ivan Ljubicic advanced to the second round of the ABN Amro on Tuesday.
Fourth-seeded Tomas Berdych, however, was knocked out after losing to Mikhail Youzhny of Russia 6-4, 6-7 (5), 6-1.
Robredo beat Simone Bolelli of Italy 6-2, 6-2, while Ljubicic downed doubles partner Thiemo de Bakker of the Netherlands 7-5, 6-3.
Berdych became the first seeded player ousted from the tournament as Youzhny raced to a 5-0 lead in the third set.
Sixth-seeded David Ferrer of Spain overpowered Christophe Rochus of Belgium 6-3, 6-0, finding all corners of the court with strong shots.
Kristof Vliegen, who helped Belgium defeat Australia last week in the Davis Cup, beat Jarkko Nieminen of Finland 6-1, 6-4, and Florian Mayer of Germany beat Dominik Hrbaty of Slovenia 7-6 (5), 2-6, 7-5.
Lleyton Hewitt pulled out of the tournament, a day before his opening match, saying a hamstring he injured last week in Marseille had not recovered.
"It's improving, but it's improving slowly," Hewitt said.