Jon Jones, of Endicott, N.Y., celebrates after beating Rampage Jackson, of Irvine, Calif., to retain his UFC light heavyweight title, Saturday, Sept. 24, 2011, in Denver. Jones won the fight with a knockout in the fourth round.

Jack Dempsey / AP

Jon Jones, of Endicott, N.Y., celebrates after beating Rampage Jackson, of Irvine, Calif., to retain his UFC light heavyweight title, Saturday, Sept. 24, 2011, in Denver. Jones won the fight with a knockout in the fourth round.