....None other than BJ Penn. Says he was the most highly skilled opponent he has ever faced. That he was a very COMPLETE mixed martial artist. St.Pierre says the fight that he took the most damage in was against Carlos Condit. He says the kick Condit landed on him ruptured a vein in his head. Oddly enough, he says that BISPING is the toughest opponent he has faced in terms of how durable Mike was.