Active: 1989-2010
Teams: Mariners/Reds/WhiteSox

A lot of mean dudes on this list, and rightfully so, playing baseball well with a little chip on your shoulder is pretty badass. But you know what else is definitely badass: having this much damn fun playing baseball. "The Kid" could've been the clean home run champ if injuries hadn't robbed him of multiple seasons in his prime, but we'd prefer to remember his heyday as one of the smoothest, most infectiously joyful players in history.