I'm not entirely shocked by Vesely's win today. He's a young guy with a great deal of potential. I am most impressed that he held not only his nerve at the tail end of the third set, but also his resolve after the second. The top guys win a lot matches on emotion and belief (or lack thereof depending on what side of the net you are standing).
Novak has been showing some vulnerability this season despite the admittedly awesome results. He was wobbly at Indian Wells, scraped by his Davis Cup match, and didn't exactly waltz his way to the trophy at the AO. The smallest cracks will be exploited by the opposition, right? You would think that every player in the locker room is gunning for a win vs the world #1. It's one of the reasons holding the top spot is more difficult than just winning matches.