There are some major rematches coming up inside the Octagon over the remaining months in 2013 including Cain Velasquez-Junior dos Santos, Ronda Rousey-Miesha Tate, and Anderson Silva-Chris Weidman. Last week also saw news surface stating B.J. Penn and Frankie Edgar would be facing off for a third time, albeit at 145 pounds rather than lightweight like their previous pairings. Rematches are big business in MMA, and though some cases involve tilts that aren’t really necessary, there are plenty of possibilities out there worth considering when it comes to past opponents facing off again. (Photos by USA Today Sports Images)