The Ultimate Fighting Championship returns to action Saturday night with a loaded UFC 84: Ill Will. You can watch the event live right here at Yahoo! Sports. Friday, we'll have a free live stream of the weigh-ins from the MGM in Las Vegas at 7 p.m. ET/4 p.m. PT. The card features the UFC lightweight title match between current champion B.J. Penn and former champ Sean Sherk; Tito Ortiz's final ...