Stu Ungar (played here by SOPRANOS star Michael Imperioli) carved out a name for himself by amassing a small fortune in gambling winnings after taking up poker at an early age. Now his story is laid bare in HIGH ROLLER. A three-time winner of the Poker World Series, Stu seemed to have it all. But sadly, his motivation for playing was fuelled by an addiction to gambling that could only lead to a sorry end.