Fourth seed Angelique Kerber came through in three sets against Georgia's Anna Tatishvili, while her fellow German Sabine Lisicki beat Czech Lucie Safarova 6-2 6-4.
In the only other first-round match on the opening day, Spain's Conchita Martinez ousted the only German player in the main draw, wild card Anna-Lena Groenefeld, 7-6 6-2.