Defending champion Maria Sharapova continued her return to form as she swept past Colombia's Mariana Duque-Marino at the Madrid Open.
Sharapova had lost early in her last three tournaments but beat Duque-Marino 6-1 6-2 to reach the last 16.
Czech fourth seed Petra Kvitova came through a testing encounter against American Coco Vandeweghe 6-4 2-6 6-3.
Victoria Azarenka beat Ajla Tomljanovic 6-3 6-3 to set up a third-round meeting with American top seed Serena Williams.
In the men's event, 13th seed Gael Monfils thrashed Serb Viktor Troicki 6-2 6-0, while Bulgarian 10th seed Grigor Dimitrov led Donald Young 6-4 3-0 before the American retired.