Originally Posted by Goenitz_196
By the time Pete Sampras was 19 years old he had already pocketed 2 Grand Slams....
As Dirk already pointed out, he only had the US Open at 19, but if you look compare them at the same age (they are almost exactly 10 years apart), where Federer has just won his third GS, Sampras had just won his fifth (Wimbledon 1994).
Roger would have to win the USO, and the AO just to stay with him. That's a tall task.