Frank Gore
Gore spent 16 seasons in the NFL and fans appreciated his durability. But perhaps it wasn’t the best decision to enter the world of combat sports after he retired. He put his body through the wringer during his days as a running back. Meanwhile, he also earned a fortune from lucrative football contracts.
Nonetheless, Gore couldn’t resist the allure of the bright lights. First, he lost a decision against Deron Williams in an exhibition bout. But he won his professional debut against Olaseyinde Olorunsola as he scored a brutal knockout. Furthermore, doctors found disturbing white spots on his brain during a scan (via New York Post).