Fifth-seeded Patty Schnyder beat Chanda Rubin 6-2, 6-2 Monday to advance to the second round of the Porsche Grand Prix.
Michaella Krajicek, behind 13 aces, defeated Samantha Stosur 6-2, 6-7 (2), 6-1 in the only other first-round match Monday at the indoor tournament.
Several top stars have withdrawn from the tournament because of injury, including Kim Clijsters, Justine Henin-Hardenne, Maria Sharapova, Lindsay Davenport and Serena and Venus Williams.
Top-seeded Amelie Mauresmo, Svetlana Kuznetsova, Elena Dementieva and Nadia Petrova all have byes into the second round.