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Abe Petrovsky, played by Martin Landau, is a retired professional poker player in the film Rounders. He serves as a mentor to the protagonist, Mike McDermott (Matt Damon), and provides him with valuable advice and support as he navigates the high-stakes world of poker. Landau's portrayal of Petrovsky is nuanced and memorable, capturing the character's wisdom, experience, and unwavering loyalty.