High Quality Content by WIKIPEDIA articles! Moneyball: The Art of Winning an Unfair Game is a book by Michael Lewis, published in 2003, about the Oakland Athletics baseball team and its general manager Billy Beane. Its focus is the team`s analytical, evidence-based, sabermetric approach to assembling a competitive baseball team, despite Oakland`s disadvantaged revenue situation. A film based on the book starring Brad Pitt was released in 2011.