The CRITERION CHANNEL is currently featuring a series of 18 films about gambling. Check out their app on your connected television to view an interesting collection, including some not the usual suspects. For example:

CALIFORNIA SPLIT (1974). Elliott Gould and George Segal. A scene at Hollywood Park. That ending!
THE HUSTLER (1961). Paul Newman: “Sarah, am I a loser?”
THE GAMBLER (1974). The original w/James Caan. Not the remake with Dirk Diggler or the television thing with Kenny Rogers.
CROUPIER (1998) Clive Owen.
BOB LE FLAMBEUR (1956) For those thinking about robbing Deauville.
ANY NUMBER CAN PLAY (1949) Clark Gable
BAY OF ANGELS (1963) Jeanne Moreau
PALE FLOWER (1964) Japan