Video: Check out the bruising work of new heavyweight champ Deontay Wilder Posted on January 27, 2015 by Robert Morales Deontay Wilder on Jan. 17 became the first American heavyweight world champion since June 2007 when he won a one-sided decision over Bermane Stiverne at MGM Grand in Las Vegas. Check out this video to see what Stiverne was up against: