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Mattress Mack Wins $72.66 Million, Biggest Win in Sports Betting History.

A high roller, also referred to as a whale or cheetah, is a gambler who consistently wagers large amounts of money. High rollers often receive lavish "comps" from casinos to lure them onto the gambling floors, such as free private jet transfers, limousine use and use of the casinos' best suites.