Jose Aldo's change of opponent from Erik Koch to Frankie Edgar has sent shockwaves of excitement through the MMA world. It's the toughest opponent Aldo has faced to date as champion, and for the first time in his WEC turned UFC reign of the featherweight division, he is not a gigantic favorite. Early betting lines have Aldo as a slight favorite over the former lightweight champion Edgar. (Via BestFightOdds)
The only other time an Aldo opponent was this close to even money was Mark Hominick at UFC 129, who opened at +197 before ballooning to +450 at fight time. Note that only a few lines have been released from various gambling websites, so the image you currently see will change over the next several days.
Of course, if there's anyone who knows how to win as a betting underdog, it's Frankie Edgar. The wait is almost excruciating and the fight was only announced yesterday.