Nelslus is a BAD boy! Truly, though, I think that all four (plus-Roddick) are in a real tenuous place. I suddenly am considering Del Potro stock a LOT more seriously. The huge consideration with Del Potro of course will be how that VERY tall body will hold up over time. I'm not sure that tennis is really meant to be played on a top level for a player QUITE so tall in the long-term. Still, if I'm wrong about this- he looks REAL dangerous to me. And to then think that he has considerable areas in his game that he can improve.....