Nick Diaz has never been submitted in an MMA bout. While that streak may be safe as he sits out a suspension from the Nevada Athletic Commission for testing positive for a banned substance after his loss to Carlos Condit, his BJJ will be tested soon. Diaz will participate in a bout with Braulio Estima. (Since it's not an MMA bout, he doesn't need a license so he's not violating the suspension.)
Estima is a highly-credentialed blackbelt in jiu-jitsu. He has won a world championship and numerous titles in BJJ and has two gold medals and a silver from the respected Abu Dhabi grappling tournament. In other words, he's one of the best around at groundwork.
Diaz and Estima will not wear gis (the traditional garment for BJJ) in their bout, making it more like an MMA bout. Diaz has eight wins by submission, but few opponents have the grappling skill of Estima. Will Diaz be able to win this bout? Tell us in the comments, on Twitter or on Facebook.