I was thinking this match-up over a bit, and I couldn't help but wonder just how effective Del Potro might prove to be against Nadal on clay. On hardcourts, Del Potro has shown that he can pretty much make Nadal his ***** ever since his win against him at Miami in 2009. U.S. Open semi-final being another example of the kind of trouble that Del Potro presents Nadal. Even though Del Potro doesn't really have all the titles and glorious clay wins that would suggest that he can compete with Nadal on clay- he has shown that he has no trouble with Nadal on other surfaces. Also, a big hard-hitting player like Del Po (Soderling) beat Nadal on his best surface (potential health questions aside). I think that of the various challengers that Nadal would face, Del Potro would easily be one of the best to contend with Nadal. He made it to the semi-finals of the tournament last year, and nearly beat the eventual champion in the process. I'm really disappointed that Del Po has had such bad luck with his wrist this year since I think that they would make for a really interesting match-up on clay.