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An injury has forced Sean Pierson out of a scheduled UFC 158 bout against Rick Story, replacing him will be Quinn Mulhern. Story has only won one of his last four in UFC competition, with that lone victory coming over Brock Jardine. Mulhern will be making his UFC debut after a strong run in Strikeforce, where he won three of four in the promotion. UFC 156 takes place on March 16th from the Bell Centre in Montreal, Quebec, Canada with Georges St. Pierre and Nick Diaz headlining.
