<p>Robby Hammock, who caught Randy Johnson's perfect game for Arizona on May 18, 2004, was one of two players promoted by the Diamondbacks on Wednesday.</p><p>Hammock, who played college baseball for Georgia, was with the Diamondbacks for extended stints in 2003-04, then missed virtually the entire 2005 season due to right shoulder surgery. He spent this season in Triple-A.</p><p>Outfielder Scott Hairston was promoted for the third time this year.</p>
