During the Grand Opening of Lyoto Machida’s new Machida Karate gym in Belem, Brazil, onlookers caught a rare glimpse at a training session between former UFC light-heavyweight champion Lyoto Machida and current UFC heavyweight champion Junior dos Santos.

The video shows the two Brazilian’s engaging in a competitive grappling match. To see who has the better ground skills head on over to page two and check out the unedited video.