1. Georges St. Pierre
History will remember St. Pierre as not only the best mixed martial artist Canada has produced but perhaps the greatest MMA fighter of all-time.“Rush” reclaimed the welterweight championship by stopping Serra with knees to the body at UFC 83 on April 19, 2008 and remained on the 170-pound throne until December 13, 2013, when he vacated the title following a hard-fought and controversial decision over Hendricks at UFC 167. St. Pierre has been absent from the MMA scene for nearly three full years now, but talk of a possible return continues to build, with Diaz, current welterweight champion Tyron Woodley, reigning middleweight titleholder Michael Bisping, Conor McGregor and Anderson Silva all mentioned as potential opponents.