Behind his 12 strikeouts, the Big Unit led the Diamondbacks to a 2 - 0 win over the Atlanta Braves on May 18, 2004. Becoming the oldest pitcher in Major League history to throw a perfect game and 5th player to throw a no hitter in both leagues. Offered here is an Official Major League (Selig) ball that used in the contest. Johnson has signed and inscribed "Ball Used in Game - May 18 2004 - Perfect Game" above his signature. Accompanied with a letter signed by Johnson stating that the ball used in the game.