Ball Four is a book written by former Major League Baseball pitcher Jim Bouton in 1970. The book is a diary of Bouton's 1969 season, spent with the Seattle Pilots and then the Houston Astros following a late-season trade. In it Bouton also recounts much of his baseball career, spent mainly with the New York Yankees. Despite its controversy at the time, with baseball commissioner Bowie Kuhn's attempts to discredit it and label it as detrimental to the sport, it is considered to be one of the most important sports books ever written and the only sports-themed book to make the New York Public Library's 1996 list of Books of the Century. It also is listed in Time magazine's 100 greatest non-fiction books of all time.