I was also surprised by the final match, I thought BJ would have put on a better performance. BJ Penn is coming from a lighter weight class, but he took the fight at 170. That’s the bottom line. I knew it was going to come down to who had the better cardio and even at the end of the first round BJ looked tired. Now, on to what everybody is talking about, the greasing. I’m not the only one who has said that GSP felt greasy during a fight. I know Matt Serra has mentioned it and, even in their first fight, I think BJ said something. I’m not saying GSP did something wrong and I’m not saying that it would have changed any outcomes of any fights; but what I am saying is, for my last two fights against Georges, he felt greasy.
From Matt Hughes' blog.