Rafael Nadal sweeps aside Russia 's Nikolay Davydenko 6-2 6-2 at the Madrid Open . Second-ranked Nadal shows no weakness on Madrid 's new blue clay . World No . 3 Roger Federer battles past Milos Raonic in his opening match . French Open champion Li Na sets up clash with world U.S. Open champion Samantha Stosur of Australian also reached the last eight with a 6-3 6-2 win over Czech Petra Cetkovska . No. 1 Serena Williams. Victoria Azarenka .
Rafael Nadal sweeps aside Russia 's Nikolay Davydenko 6-2 6-2 at the Madrid Open . Second-ranked Nadal shows no weakness on Madrid 's new blue clay . World No . 3 Roger Federer battles past Milos Raonic in his opening match . French Open champion Li Na sets up clash with world No. 1 Serena Williams. Victoria Azarenka .