Arizona Diamondbacks starting pitcher Patrick Corbin delivers during the first inning of a baseball game against the Pittsburgh Pirates in Pittsburgh on Tuesday, Aug. 7, 2012. (AP Photo/Gene J. Puskar)

Pittsburgh Pirates' Travis Snider, left, slides past Arizona Diamondbacks catcher Miguel Montero as the ball skips away from Montero, to score on a single by Andrew McCutchen in the third inning of a baseball game in Pittsburgh on Tuesday, Aug. 7, 2012. (AP Photo/Gene J. Puskar)

Arizona Diamondbacks' Stephen Drew, right, is greeted by Aaron Hill (2) after hitting a solo-home run off Pittsburgh Pirates starting pitcher Jeff Karstens (27) in the third inning of a baseball game in Pittsburgh, Tuesday, Aug. 7, 2012. (AP Photo/Gene J. Puskar)

Arizona Diamondbacks' Chris Johnson, left, rounds third to greetings from third base coach Matt Williams (9) after hitting a three-run home run off Pittsburgh Pirates relief pitcher Jason Grilli (39) in the eighth inning of a baseball game in Pittsburgh, Tuesday, Aug. 7, 2012. (AP Photo/Gene J. Puskar)

Arizona Diamondbacks' Chris Johnson (28) is greeted as he crosses home plate by Justin Upton, center, as Pittsburgh Pirates catcher Michael McKenry, right, watches after Johnson hit a three-run home run in the eighth inning of a baseball game in Pittsburgh on Tuesday, Aug. 7, 2012. (AP Photo/Gene J. Puskar)

Arizona Diamondbacks' Chris Johnson is welcomed back to the dugout by manager Kirk Gibson after hitting a three-run home run off Pittsburgh Pirates relief pitcher Jason Grilli in the eighth inning of a baseball game in Pittsburgh on Tuesday, Aug. 7, 2012. (AP Photo/Gene J. Puskar)

Pittsburgh Pirates starting pitcher Jeff Karstens delivers during the first inning of a baseball game against the Arizona Diamondbacks in Pittsburgh on Tuesday, Aug. 7, 2012. (AP Photo/Gene J. Puskar)

Arizona Diamondbacks' Chris Johnson heads home on two-run home run off Pittsburgh Pirates relief pitcher Jared Hughes, right, in the ninth inning of a baseball game in Pittsburgh on Tuesday, Aug. 7, 2012. Johnson had five RBIs in the Diamondbacks' 10-4 win. (AP Photo/Gene J. Puskar)

Arizona Diamondbacks manager Kirk Gibson gives signs from the dugout during the first inning of a baseball game against the Pittsburgh Pirates in Pittsburgh on Tuesday, Aug. 7, 2012. (AP Photo/Gene J. Puskar)

Pittsburgh Pirates relief pitcher Jason Grilli (39) stands on the mound with right fielder Garrett Jones, right, after serving up a three-run home run to Arizona Diamondbacks' Chris Johnson in the eighth inning of a baseball game in Pittsburgh on Tuesday, Aug. 7, 2012. Grilli was removed from the game, which the Diamondbacks won 10-4. (AP Photo/Gene J. Puskar)

Pittsburgh Pirates' Starling Marte, right, is greeted by Michael McKenry, center, and Garrett Jones, left, as he returns to the dugout after hitting a solo home run off Arizona Diamondbacks relief pitcher Takashi Saito in the seventh inning of a baseball game in Pittsburgh Tuesday, Aug. 7, 2012. The Diamondbacks won 10-4. (AP Photo/Gene J. Puskar)

In an Aug. 7, 2012 file photo Arizona Diamondbacks' Chris Johnson, left, rounds third to greetings from third base coach Matt Williams (9) after hitting a three-run home run in a baseball game in Pittsburgh. Johnson was one of the players traded by the Houston Astros as they rebuild their team for the future. (AP Photo/Gene J. Puskar, file)