Wallid Ismail choked out royce gracie in 98 i use to have the clip on my computer..
"After a short feeling-out period, Royce took down Wallid. Wallid returned to his knees, and Royce went to the guard. Wallid began to pass, and Royce turned his back. From behind, Wallid applied a clock choke. Royce didn't tap, but passed out unconscious. Time: Approx five minutes. (This was a jiu-jitsu match, with no time limit and no points. Wallid is a top jiu-jitsu competitor on Carlson Gracie's team.) "
heres a link: http://www.bjj.org/tournaments/outcomes.html