I've wondered if the mystic of playing with Tiger interrupts the pace of a professionals' game.  A player in Tigers group doesn't want to make Tiger wait, or more nervous with Tiger watching, or won't take the time to read a putt.  When Phil eluded to Butch giving him pointers on how to play better with Tiger seemed to comfirm that thought.  Zach Johnson and Angel Cabrerra did an amazing job to win the Masters and Open respectively with Tiger on the leader board, but of course Tiger wasn't in their respective groups.  There have only been a handful of showdowns on Sunday that a guy was able to beat Tiger, Hal Sutton, Vijay Singh when he took the number one spot, for what, a minute.  Phil at the Deutsche Bank last year.  It's happened, but so rarely compared to Tiger prevailing.