STUTTGART, Germany — Sixth-seeded Agustin Calleri beat Jurgen Melzer of Austria 7-6 (3), 6-4 to advance to the second round of the rain-filled Mercedes Cup today.

Calleri was making his first appearance in Stuttgart since 1999, and will play fellow South American Pablo Cuevas next to try and reach his seventh quarterfinal of the season.

Fellow Argentine, No. 8-seeded Eduardo Schwank rallied from a first-set blanking to beat 2003 champion and countryman Guillermo Coria 0-6, 6-1, 6-2.

In a battle of qualifiers, Lukas Rosol of the Czech Republic beat Martin Fischer of Austria 6-2, 6-4. Qualifier Yuri Schukin of Kazakhstan rallied to defeat Carlos Berlocq of Argentina 4-6, 7-5, 6-3.

The 188th-ranked Rosol faces second-seeded Richard Gasquet of France, the tournament favorite following the withdrawal of defending champion Rafael Nadal.

Anna Kournikova played an exhibition mixed doubles with Henri Leconte against former Wimbledon champion Michael Stich and Barbara Schett.