I don't believe Novak Djokovic thinks Rafael Nadal is the toughest opponent on clay these days, I think he's more concerned about many other players" - Mats Wilander
Roger Federer - Wikipedia
Mats Wilander Biography, Age, Height, Weight, Family, Wiki & More | Mats wilander, Biography, Birth sign
File:Mats Wilander at the 2010 US Open 01.jpg - Wikimedia Commons