10. Randy Johnson
Randy Johnson rocked your basic power mullet, and he did it well beyond the acceptable time period (if it ever was acceptable). It was short and conservative up front, yet long and stringy on the back.
Johnson would also appear on a “10 Ugliest Athletes in Sports” list, and that’s largely due to his impressively repulsive power mullet. As a 6’10” southpaw, The Big Unit used intimidation as much as any other attribute to mow down batters. His hair was a vital aspect intimidating tactics. Secretly, I think Randy would admit that his hair was offensive. He sacrificed his appearance, albeit the dude is ugly as balls anyway, for an edge on the mound.