Posted by Sabrina B. @gametimegirl Brock Lesnar will return to the UFC octagon in a five-round main event Dec. 30 at MGM Grand in Las Vegas, facing newly signed former Strikeforce heavyweight champion Alistair Overeem. “Brock is a big name, a dangerous guy, and this is a dream matchup,” Overeem told The Times on Tuesday, just after signing a standard UFC fight contract in the office of Chairman Lorenzo Fertitta. “Brock’s a big guy, an exciting wrestler with his takedowns.