#3 Andrei Arlovski
The Pitbull's days as the explosive heavyweight contender have long gone as he has lost eight of his last ten fights, with the most recent setback coming against Walt Harris at UFC 232.
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The former UFC Heavyweight Champion has dabbled in acting too, which have largely been unremarked as they weren't major hits. His first movie was a low-budget heist flick called 8 of Diamonds that also starred Eric Roberts.
He was in the third and fourth installments of the Universal Soldier series. It should be noted that Arlovski played the role of the main antagonist in Universal Soldier: Regeneration alongside Jaune-Claude Van Damme in 2009.
He also played the part of a Russian Mobster in a short scene in The Equalizer 2 that had Denzel Washington. The 39-year-old Belarusian has also appeared in the TV show Limitless and MTV's Bully Beatdown.
We're sure Arlovski would be considering dedicating his time to acting on a full-time basis whenever he does hang up his gloves.