Almagro rallied to defeat Australian Peter Luczak 5-7, 7-6 (7-3), 6-1.
Frederico Gil of Portugal eliminated Austrian Stefan Koubek 4-6, 6-4, 6-4.
Other opening-round winners included German Daniel Brands, American Wayne Odesnik and Romania's Victor Crivoi.
Copyright 2009 by United Press International.