Fourth seed Victoria Azarenka was upset 6-4 6-3 in the second round of the Porsche Tennis Grand Prix by claycourt specialist Gisela Dulko.
The world number eight Azarenka came into the Stuttgart event off the back of three tournament wins this season: Brisbane, Memphis and Miami.
Defending champion Jelena Jankovic lost just two games to Slovakian Dominika Cibulkova to reach the second round. She will next face Sabine Lisicki following her 6-4 6-3 win over Patty Schnyder.
In other first-round matches fifth seed Svetlana Kuznetsova had a hard task against German qualifier Andrea Petkovic, winning 6-4 5-7 6-1. Nadia Petrova also needed three sets to beat Zheng Jie 6-4 5-7 6-4, while Daniela Hantuchova defeated Alize Cornet 6-3 6-1. Also, Flavia Pennetta advanced with a 6-2 6-0 victory over Anna Chakvetadze. (photo: Ralf Reinecke)