I'm a fan of both Penn and GSP so I'm happy just to see the match up. I don't know who will win...it has been quite a while since they've faced off against each other. I've seen a lot of changes in GSP, growth as a fighter. However, BJ is both skilled and naturally talented. There are so many factors in an MMA fight, mental and physical. I think that if GSP comes into the fight with a strong mindset, trains hard as he usually does, I think he can win.