16. Georges St. Pierre
Bonafides From 2002-2012: UFC Welterweight Champion, Former UCC Welterweight Champion,17-2-0 (7 KOs, 5 Submissions)
In any individual sport, longevity is a hard thing to maintain, which is what makes Georges St. Pierre such a phenomenal athlete. Since defeating Matt Hughes to win the undisputed Welterweight Championship on November 18, 2006, St. Pierre has only lost once and it was a fluke. Several skilled fighters have tried to pry the belt away from GSP's grip and all have failed. It's likely that the Canadian will need to step up another weight class in the near future to get some decent comp, but all we care about is when he's going to get into the Octagon with Anderson Silva.