Duel is an American game show hosted by Mike Greenberg that first aired from December 17 to December 23, 2007, on ABC. The show aired as a week-long six-episode tournament at 8:00 p.m. from Monday through Friday with the finale on Sunday. The show's website described the program as a cross between Who Wants to Be a Millionaire? and the World Series of Poker. imdb.com