Man from the South with Peter Lorre and Steve McQueen (1960)

Alfred Hitchcock Presents (1960)
Season 5 Episode 15 - Man from the South
https://www.imdb.com/title/tt0508196/

In a Las Vegas casino, an unpleasant little man hopes to use a young man's wish to impress the young woman he has just met to pressure the young fellow into accepting a macabre bet.