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ATP World Tour 2009 er den 20. udgave af ATP Tour, som administreres af Association of Tennis Professionals (ATP). ATP World Tour 2009 består af fire Grand Slam-turneringer, som arrangeres af International Tennis Federation (ITF), ni ATP World Tour Masters 1000-turneringer, 11 ATP World Tour 500-turneringer, 40 ATP World Tour 250-turneringer, ATP World Team Championship, Davis Cup (arrangeret af ITF) samt ATP World Tour Finals.