I'm a big fan of Jack Sock, but his attitude can definitely sway his performance a little more than I'd like to see. Monaco got in his head a little, and it killed him during most of the 2nd set and pretty much all of the 3rd set. It was a great win for Monaco, but these are the kind of matches Sock will have to win if he's ever going to get to the next level (Top 10 or 15 at least). Hopefully he'll have a solid clay court season. He's one of the Americans who enjoys the clay surface, and I hope it ends up in some success the next couple months.