LAS VEGAS - Brock Lesnar was tested, but the big man wasn't bested.
The world's new No. 1 ranked heavyweight fighter and now-undisputed champion survived a dangerous first-round attack from interim title-holder Shane Carwin but reigned supreme for a second-round submission victory.
The title-unification bout headlined Saturday's UFC 116 pay-per-view event at the MGM Grand Garden Arena in Las Vegas.