B.J. Penn
At UFC 58, St-Pierre defeated former UFC welterweight champion B.J. Penn to become the No. 1 contender for the UFC welterweight title. St-Pierre won the match by split decision and was set for a rematch against then-champion Matt Hughes at UFC 63. St-Pierre was forced to withdraw from the match, however, due to a groin injury and was replaced by the man he defeated in March, B.J. Penn. The UFC announced afterward that St-Pierre would have the opportunity to fight for the title when his condition was fully healed.