UFC president Dana White recently said that Cleveland Cavaliers center Shaquille O'Neal has been training in mixed-martial arts for years -- and lobbying to fight in the Octagon for nearly as long. Could Shaq make a successful career switch? If the history of other pro athlete-to-pro fighter crossovers is any indication, results are impossible to predict:
Too Tall Jones
Day job: Havoc-wreaking defensive end for the Dallas Cowboys.
Fighting career: Semi-respectable. Retired from football to go 6-0 as a heavyweight fighter with five KO's between 1979 and 1980 before retuning to the Cowboys; on the other hand, combined record of Jones' opponents was 37-86-1. And Jones' debut fight was marred by accusations that his corner deployed smelling salts while the fighter was on the ground.
Day job: Heisman Trophy winner; USFL/NFL running back; Olympic bobsledder.
Fighting career: Respectable. At age 47, won MMA debut match against someone named Greg Nagy, showing still-formidable athletic ability and so-so ground fighting skills.