Canadian Georges St. Pierre's biggest fight of his life will have to wait.
The Ultimate Fighting Championship announced yesterday the 25-year-old Montrealer's groin injury has rendered him unable to fight for the UFC welterweight belt against champ Matt Hughes Sept. 23.
Instead, B.J. Penn, who has beaten Hughes before, will take St. Pierre's spot in the Octagon in Anaheim, Calif., for UFC 63.
St. Pierre, Canada's biggest mixed-martial arts star, beat Penn in a split decision last March to gain the top contender status and win himself a shot at Hughes.
It would have been St. Pierre's second title fight, having lost to Hughes in October 2004.
In that fight, the young St. Pierre fell victim to a Hughes armbar with one second left in the first round.
Penn, the former welterweight champ, last fought Hughes in January of 2004, beating him with a rear naked choke in the first round.