Once upon a time, Joe Riggs (39-14 MMA, 0-1 BFC) was MMA’s version of a cautionary tale. But now, as a cast member of Bellator MMA’s new reality show “Fight Master,” the 30-year-old Riggs said he’s primed for a second run to prominence. “My ass kicking has just begun in my career,” Riggs recently told MMAjunkie.com Radio (www.mmajunkie.com/radio). “I’m hitting my second stride.” Riggs already boasts nearly 11 years of professional MMA experience, but he’s best known for an eight-fight UFC run followed by seven appearances under the Strikeforce banner.