15. Georges St. Pierre
GSP is damn near unstoppable in the octagon (24-2 with eight KOs), but unlike many of your favorite fighters he's not the major personality you'd expect. He's a soft spoken guy who's nothing like Chael Sonnen or Rampage Jackson that love to talk. Pierre pretty much dismantles his opponents like clockwork and moves on to the next one. Despite UFC's added intrigue to make the fights interesting, GSP isn't going to be a pick for top trash-talker and will win most of the time on decisions. A beast nonetheless, Pierre will forever be linked with being boring for his calm and calculated style.