Shahar Peer, Nadia Petrova advance

COLLEGE PARK, Md. -- Top seed Shahar Peer defeated Japanese qualifier Ryoko Duda 6-4, 6-2 to advance to the second round of the inaugural WTA Citi Open.

Peer became the highest-ranked women's tennis player from Israel earlier this year but came having lost four straight first-round matches.

Second-seeded Nadia Petrova of Russia handled American qualifier Alexandra Mueller 6-2, 6-2 in Mueller's first career WTA main draw match. Petrova will next face Canada's Eugenie Bouchard, who defeated American Alison Riske 6-3, 6-2.

China's Shuai Zhang upset fourth-seeded Jelena Dokic of Australia 6-3, 6-4. Dokic had 16 double-faults in the loss.

Eighth-seeded Alberta Brianti of Italy ousted Britain's Anne Keothavong 6-3, 6-4; American Madison Brengle advanced to the second round as a qualifier by defeating Melinda Czink of Hungary 7-6 (5), 7-5; and Irina Falconi of the United States eased past Belarus' Olga Govortsova 6-3, 6-4.

American Jill Craybas, the oldest player in the field at age 37, advanced over China's Jie Zheng 2-6, 6-3, 6-2; fifth-seeded Bojana Jovanovski of Serbia defeated Slovakia's Petra Rampre 6-0, 6-2; and Russia's Alla Kudryavtseva beat South African Chanelle Scheepers 4-6, 6-4, 6-2.