Wimbledon champion Petra Kvitova eased into the third round of the French Open with 6-1 6-3 victory over Urszula Radwanska at Roland Garros.
Kvitova had a stellar 2011, winning six titles, including on the grass of SW19 and at the season-ending WTA Championships, but this year has been tougher for the Czech.
Injury and illness have taken their toll and she is still looking for her first title having dropped to world number four, although so far at Roland Garros she has been exemplary.
Former world number one Caroline Wozniacki stayed on course for showdown with Maria Sharapova on Thursday in a quarter of the draw blown wide open by Serena Williams' shock exit.
Wozniacki, seeded nine this year and a quarter-finalist in 2010, breezed past Jarmila Gajdosova 6-1, 6-4 for a sixth win in six meetings against the Australian.
Gajdosova, now at 72 in the world after playing as a seed in Paris 12 months ago, paid a heavy price for her 40 unforced errors on a chilly Philippe Chatrier court.
Defending champion Li Na extended her record to only five games dropped in two rounds with a 6-0 6-2 victory over Stephanie Foretz Gacon, while the woman she beat in the final last year, Francesca Schiavone, recovered from losing the first set to beat Tsvetana Pironkova 2-6 6-3 6-1.
Two seeds were sent tumbling, Maria Kirilenko losing 6-4 3-6 6-3 to Klara Zakopalova, while Jelena Jankovic was beaten 7-6 (7/4) 4-6 6-4 by Varvara Lepchenko.
Tenth seed Angelique Kerber, who has made huge strides over the past year, saw off Olga Govortsova 6-3 6-2.
