My point is that Federer didnt cry (or show emotion) DURING a match. Sampras did... and it wasn't just that one moment for that matter.
In fact, I remember Sampras having a real dummy-spit with the umpire over a bad call... can't remember the exact game, who he played that day, etc... but I did see him fire up more than Federer ever would. Made for interesting TV viewing.
Federer keeps his cool no matter what happens on the court. He only cries when he's accepting trophies on the podium.
Agassi was another interesting one to watch until he decided to shave his head. You'd sit there p!ssing yourself laughing at that ridiculous hairpiece/wig he had on not long after he turned pro.