#2 Georges St-Pierre
Undoubtedly one of the greatest fighters of all time, Georges "Rush" St-Pierre returned to the sport of MMA after about 4 years, to defeat Michael Bisping for the latter's UFC Middleweight Championship--besting the latter in their fight last November.
St-Pierre is a former UFC Welterweight titlist as well as ex-UFC Middleweight Champion of the world. GSP is considered by many as one of the most well-rounded MMA fighters in the history of combat sports.
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GSP is tied with Donald Cerrone and the fighter we're set to discuss next--with the trio securing 20 wins respectively in the UFC. St-Pierre boasts an overall MMA record of 26 wins and 2 losses.
Furthermore, it's indeed praiseworthy that St-Pierre avenged both of his aforementioned losses in emphatic fashion--thereby making him a virtually undefeated professional MMA combatant.