Another thing about Sampras' tennis is his parents.
They are known to be very far from typical tennis parent.
They never pushed him to excel in tennis or anything.
That must be at least part of his pressure-free junior years.
It's all driven by Sampras himself and his love of the game.
Another big influence must be his early coach Dr. Pete Fischer(sp?).
A medical doctor who were deeply in love with the game, almost
madly into studying the game.