Gracie in a non-title, catch-weight bout by TKO (strikes) at 4:39 of the first round. Before the stoppage, Gracie was caught in an armlock from the side mount position; although Hughes appeared to have the submission in place, Gracie would not tap out. Hughes stated that he felt his arm pop and realized he would never tap, so instead of breaking his arm, opted to seek a different position . The event drew 620,000 buys, becoming the best-selling pay-per-view in UFC history, and was the first to break the $20 million mark in gross PPV sales. Hughes was scheduled to fight Georges St-Pierre in a rematch at UFC 63, but after St-Pierre sustained a severe groin injury, the UFC announced that B.J. Penn would replace him in the title fight. At this point in their careers, Penn was the only mixed martial artist to beat Hughes after March 2001. In fact, it was Hughes's only loss in his last 19 fights. In the bout, Penn controlled the first two rounds, but sustained a rib injury during the scramble to take Hughes's back in round two. He was visibly different in the third round, appearing exhausted and missing punches he was landing earlier. Hughes was able to take Penn to the mat, and in side-control crucifix position rained punches on Penn's head until referee "Big" John McCarthy stopped the fight at 3:53 of the third round. In the process, Hughes became the first man to stop Penn in a fight. Both fighters were awarded the Fight of the Night bonus. In an interview on Penn's personal website, Penn stated that by round three he could hardly breathe and had no "mobility in his core". Despite the injury, Penn congratulated Hughes, calling him a great fighter and saying he deserved the victory. St-Pierre stepped into the ring to promote his upcoming title fight against Hughes, stating that he was glad that Hughes won his fight, but that he was "not impressed" by Hughes's performance. According to both commentator Joe Rogan and Hughes's own autobiography, Hughes was unhappy with St-Pierre's statement. Hughes said that they "had words" off-camera shortly thereafter. St-Pierre apologized, saying he had misunderstood something Hughes had said on the microphone and did not mean to offend him. Loss to St-Pierre On November 18, 2006, at UFC 65: Bad Intentions, Georges St-Pierre defeated Hughes by TKO via strikes at 1:25 of