Novak Djokovic, Rafael Nadal and others who have complained about the blue clay at the Madrid Open are "weenies", according to former women's No 1 Serena Williams.

Asked about criticism from Djokovic and Nadal over the slippery surface on the Manolo Santana show court, Williams told a news conference, tougue firmly in cheek, that women were simply tougher than their male counterparts.

"Women are way tougher than men. That's why we have the babies, you guys could never handle kids," Williams said after thumping top seed Victoria Azarenka 6-1, 6-3 to win the Madrid title on Sunday.