Berlin:Shahar Peer was one of two seeded players to advance to the second round of the German Open, beating Anna-Lena Groenefeld 6-1, 6-2 on Monday with many matches rescheduled because of rain.
The 13th-seeded Israeli reached the semifinals at Key Biscayne, Florida, in late March, but then lost in the second round two weeks later in Charleston, South Carolina.
Fourteenth-seeded Li Na of China advanced by beating Maria Kirilenko 6-1, 3-6, 6-1.
Also, Severine Bremond of France beat Sabine Lisicki of Germany 6-2, 6-1 and Lucie Safarova of the Czech Republic downed Olga Savchuk of Ukraine 6-3, 6-7 (6), 6-0.
Top-seeded Justine Henin, Amelie Mauresmo and defending champion Nadia Petrova are also in the field at the tournament, which has drawn 16 of the world's top 20 players. Serena Williams and Nicole Vaidisova have withdrawn, however.
Petrova beat Henin in last year's final, but the top-ranked Belgian is favored to make it four wins in six years at the at the French Open warmup.
"Henin is my favorite. She is a tough cookie. I will have to come up with something different if we face each other," Petrova said. "But I have never defended a tournament title before - it is one of my career goals."
Mauresmo is making her comeback from two months off for an appendicitis operation.
"I feel physically fit. There are no aches or pains," Mauresmo said. "But of course I don't know what happens when I'm back on the Center Court having to play my first match again."
For the 25-year-old Petrova, the German Open will also be about the veterans facing some up-and-coming players.
"There's some young, hungry players out there making life tough for us," Petrova said.
That includes Jelena Jankovic, the 21-year-old Serbian who is ranked seventh after winning in Charleston last month.