Chael Sonnen to launch 'Submission Underground' grappling event series

During his competitive time in professional mixed martial arts (MMA), former UFC middleweight contender Chael Sonnen used his widely-herladed promotional abilities to raise his profile as well as those of his fights. Now retired from MMA, he's still putting those skills to use, but in a different if slightly related context.
Sonnen is officially becoming a promoter as he launches 'Submission Underground', a submission grappling event based on the superfights model. The first event is set to take