Robson, Suarez Navarro pull off upset wins in Madrid

Britain's Laura Robson and Spain's Carla Suarez Navarro conjured up big first-round upset victories at the Madrid Open when they surprised fourth seed Agnieszka Radwanska of Poland and ninth-seeded Australian Samantha Stosur on Monday.

Robson, the world number 41, thumped Radwanska 6-3, 6-1 on the clay at the Magic Box arena and 23rd-ranked Suarez Navarro ousted Stosur 7-6, 6-2 to delight the home crowd with her seventh career victory over a top-10 player.

Radwanska was the biggest casualty as second seed Maria Sharapova of Russia eased past Romanian qualifier Alexandra Dulgheru 7-5, 6-2 and third-seeded Belarussian Victoria Azarenka had to fight past Russian Anastasia Pavlyuchenkova 7-6, 7-6.

Suarez Navarro, who has never won a WTA tour title, was playing her first match since losing to Pavlyuchenkova in the final in Oeiras on Sunday.

"We only had a small window to prepare for today's match, but I was really focused," she said on the WTA website.

"Once I got here to Madrid, I didn't think of what happened in Oeiras for a single moment," the 24-year-old added.

"I just wanted to play the best I could here today. We only have one tournament here in Spain so for us it's a really important week."

World number one and top seed Serena Williams continues her Madrid title defence with a second-round match against Spaniard Lourdes Dominguez Lino on Tuesday.

Photograph: Julian Finney/Getty Images