A lifelong baseball fan, Landis often slipped away from the courthouse for a White Sox or Cubs game. In 1914, the two existing major leagues were challenged by a new league, the Federal League. In 1915, the upstart league brought suit against the existing leagues and owners under the Sherman Act and the case was assigned to Landis. Baseball owners feared that the reserve clause, which forced players to sign new contracts only with their former team, and the 10-day clause, which allowed teams (but not players) to terminate player contracts on ten days notice, would be struck down by Landis.