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#1 Vitor Belfort
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While all the other fighters on this list have been calculated guesses, Vitor Belfort's last fight has already been announced.
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Belfort donned the MMA gloves at just 19, an age when most others would've been wondering which colleges to apply to. He proved himself to be every bit "The Phenom" his nickname said he is, by becoming the youngest fighter to win a UFC tournament.
The scalps the Brazilian has collected in both PRIDE and the UFC could fill a wing in a Hall of Fame - Randy Couture, Wanderlei Silva, Dan Henderson, Rich Franklin, Rumble Johnson, Luke Rockhold and Michael Bisping are some of them.
After oscillating on the topic of retirement, Belfort will step into the octagon for the final time against fellow Brazilian legend Lyoto Machida at UFC 224 in his hometown of Rio De Janeiro.
