Ivanovic beats Petkovic in 1st round in Stuttgart

Ana Ivanovic defeated Andrea Petkovic 6-3, 6-2 Tuesday in the

first round of the Porsche Tennis Grand Prix.

Ivanovic needed just 72 minutes to dispatch the 25-year-old

Petkovic, who is struggling to regain her form after injuries.

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.

Sabine Lisicki will face Nastassja Burnett in the late