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It's the biggest event in mixed martial arts history, and for UFC 100, the Ultimate Fighting Championship is bringing out the big guns. Two championships will be on the line when UFC heavyweight title holder Brock Lesnar defends his crown against rival Frank Mir in their long-awaited grudge match, and UFC welterweight champion Georges "Rush" St-Pierre puts his belt up for grabs against Brazilian knockout artist Thiago "Pitbull" Alves. Also, The Ultimate Fighter coaches collide as Dan Henderson takes on Michael "The Count" Bisping in a pivotal middleweight showdown. UFC 100 - Saturday, July 11, live on Pay-Per-View from the Mandalay Bay Events Center in Las Vegas. Nevada.