Pretty much ALL of the challenger guys are capable of this on any given Sunday as they say. All you need is a top player whose off his game and a nobody in the zone, and you see just how very little separates at this level. After a while, you can only hit a ball so well. The biggest difference between the nobodies and somebodies is often times mental, consistency, etc. Maybe for a few games here and there they can be hot shots, but after they tend to just go away a lot more than top players do.