Johnny Walker

Johnny Walker is a rangy, unorthodox Brazilian striker who has trained all over the world — Team Nogueira in Rio, SBG Ireland, Russia, Thailand — and now works out of Xtreme Couture in Las Vegas. Seventeen of his 22 career wins have come by knockout, the calling card that made him one of light heavyweight's most talked-about prospects when he burst into the UFC, but his career has been defined by feast-or-famine stretches ever since. He now abandons 205 pounds for good, making his heavyweight debut against a ranked opponent after a split-decision loss to Dominick Reyes at UFC 327. At 34, this is as much a reinvention as it is a fight.