In the fourth fight on the main card at UFC Rio at HSBC Arena in Rio de Janeiro, Brazil on Saturday, Shogun Rua knocked out Forrest Griffin at 1:53 of the first round.

{flvremote}http://cdn.ianbethune.com/ufcriorua.flv|375|281{/flvremote}

Watch this video on your smartphone

Follow Ian on Twitter @soxanddawgs. And be sure to like us on Facebook as well.