Most teams would be pretty easy to choose 4 top players. I'm proud to say as a Yankees fan, narrowing it down to 4 players is extremely difficult.
Ruth, Gehrig, DiMaggio, Mantle, Jeter, and Rivera. Can I take 6? Sorry to Berra, Dickey, Posada, Combs, Lazzeri, Ford, Pennock, Ruffing, Gossage, Rizzuto, ARod, Williams, etc etc etc.