Defending champion Serena Williams eased into the last 16 at the Madrid Open with a straight-sets win over Spanish wildcard Lourdes Dominguez Lino.
Williams, the world number one, prevailed 6-2 7-5 in an hour and 25 minutes and will play either 13th-seeded Russian Maria Kirilenko or Frenchwoman Kristina Mladenovic in the next round.
Chasing a fourth title of the year and 50th of her career, Williams dominated the slightly-built Dominguez Lino, who nonetheless managed to unsettle her more powerful opponent with some drop shots and lobs.
"I made a lot of errors, but her game kind of forces you to make errors," the American said. "It was a really good claycourt tennis match for me.
"Seeing as I have a few more tournaments on clay, it was perfect to play a match like this, so I know if I face another opponent like that I'll have that experience and I'll know how to play."
Also on Tuesday, 14th seed Marion Bartoli from France saw off Spain's Maria Teresa Torro 6-4 2-6 6-4, while Germany's Sabine Lisicki sent 15th-seeded Slovak Dominika Cibulkova packing 7-6 (7/4) 7-6 (7/3).
Ana Ivanovic, the 16th seed from Serbia, progressed safely with a 6-2 6-2 triumph over South Africa's Chanelle Scheepers.
Svetlana Kuznetsova won the all-Russian battle with 11th seed Nadia Petrova, 7-6 (7/2) 4-6 6-4.
In the final match, Maria Sharapova wasted little time in seeing off American Christina McHale 6-1 6-2. The result means the Russian, seeded second for the tournament, has now won her last 18 outings on clay.