Yeah, even I saw Sampras beat Robby Ginepri  here in Frisco. But again, Federer loses so many exhibition matches and I do not think he takes other tournaments other than the Grand Slams too seriously.  Sampras would still be competitive if he were to come back from retirement but I do not see him come close to another Grand Slam. (unless Agassi makes a comeback and they have a Grand Slam Final Matchup LOL  )