20. Mel Hall
Mel Hall was one of those players who was just good enough to carve out a career at the highest level, without being outstanding. He was a bit of a journeyman, playing for the likes of the Chicago Cubs, Cleveland Indians, New York Yankees and San Francisco Giants. He also played in Japan from 1993-95.
In 1999 he was arrested for raping a 12-year-old girl on the youth basketball team that he was coaching, making him one of the most disgusting people on this list. He was also infatuated with a 15-year-old girl while he was a pro player. While he was playing MLB, she was getting ready for her prom and SATs. Now, this mad man is serving 45 years in prison.