The sport of MMA is an up-and-down endeavor with competitors typically being defined by their recent runs rather than overall contributions in the cage. A Mixed Martial Artist can be a breakout star one year and looking for employment the next; a potential-laden prospect one year and yesterday’s news the next. It’s a harsh business and, for more than a few fighters, 2013 has been a period of time many would like to forget. (Photos by USA Today Sports Images)