MADRID, Spain - Playing doubles for the first time since capturing their 11th Grand Slam at the Australian Open in January, Serena and Venus Williams showed a bit of rust, but advanced at the Mutua Madrileña Madrid Open.

In recent years, the sisters have mostly just played doubles in Grand Slams and Olympics, thus 13 of their 17 career titles together are in those events. Nevertheless, the No.1 seeds' 76(4) 62 victory over Alicja Rosolska and Yaroslava Shvedova on Tuesday put them in the quarterfinals against Maria Kirilenko and Agnieszka Radwanska, who defeated Chan Yung-Jan and Zheng Jie, 76(2) 36 107.

Eighth-seeded Gisela Dulko and Flavia Pennetta topped Indian Wells champions Kveta Peschke and Katarina Srebotnik, 63 76(3), in a first round battle featuring two of the most prolific teams on the Sony Ericsson WTA Tour this year. It was the 15th straight win for Dulko and Pennetta, who just secured their third straight Premier title Saturday in Rome. They moved on to Madrid's final eight when wildcards Dinara Safina and Agnes Szavay withdrew because of a right thigh injury suffered by Szavay in singles action.

Up next for Dulko and Pennetta are Anastasia Rodionova and Patty Schnyder, who in Tuesday's only upset, edged No.3 seeds Nadia Petrova and Samantha Stosur, 46 64 106.

Sixth-seeded Lisa Raymond and Rennae Stubbs won their first round match Tuesday and are scheduled to play their second round match Wednesday, as are second-seeded Nuria Llagostera Vives and María José Martínez Sánchez and fourth-seeded Liezel Huber and Anabel Medina Garrigues.