4. Cristiano Ronaldo 2003 – 09
He may have only played for the club for six years, but he is the only United player on this list to bag 42 goals in a single season and it is a feat that will most likely stand for some time to come.
Now one of the best players in the world, his ability and stardom would not be anywhere near as high as it is without his education at the club under the wing of Sir Alex Ferguson and he has the team and personal awards to prove it.