Ana Ivanovic beats Andrea Petkovic in Stuttgart

Serbia's Ana Ivanovic defeated Andrea Petkovic 6-3, 6-2 Tuesday in the first round of the Porsche Tennis Grand Prix. Ivanovic needed just under 73 minutes to

Ana Ivanovic hasn't made it past the round of 16 in a tournament this season :: Dennis Grombkowski/Getty Images

Serbia's Ana Ivanovic defeated Andrea Petkovic 6-3, 6-2 Tuesday in the first round of the Porsche Tennis Grand Prix.

Ivanovic needed just under 73 minutes to dispatch the 25-year-old Petkovic, who is struggling to regain her form after injury setbacks.

The eighth-seeded Nadia Petrova of Russia avoided an upset by beating 21-year-old Dinah Pfizenmaier of Germany 7-6 (2), 6-4. Mirjana Lucic-Baroni of Croatia defeated another Russian, Elena Vesnina, 6-0, 6-4.

Germany's Sabine Lisicki was playing Nastassja Burnett of Italy in the late match.