who holds the record for most wins in major league baseball
List of best Major League Baseball season win-loss records The all-time best single season record belongs to the Cincinnati Red Stockings, who posted baseball's only perfect record at 67–0 (57–0 against National Association of Base Ball Players clubs) in 1869. Their record would stretch to 81–0 across the 1870 season before losing 8–7 in eleven innings to the Brooklyn Atlantics in Brooklyn on June 14.[1][2]