Arizona Diamondbacks starter Trevor Cahill, bottom right, throws to the San Francisco Giants as a rainbow appears in the sky during the first inning of a baseball game on Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

Arizona Diamondbacks' Miguel Montero drives in a run with a single against the San Francisco Giants during the first inning of a baseball game on Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

Arizona Diamondbacks' Adam Eaton scores on a single by Miguel Montero during the first inning of a baseball game on Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

Arizona Diamondbacks starter Trevor Cahill throws to the San Francisco Giants during the first inning of a baseball game on Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

Arizona Diamondbacks starter Trevor Cahill throws to the San Francisco Giants during the first inning of a baseball game on Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco Giants starting pitcher Madison Bumgarner throws to the Arizona Diamondbacks during the first inning of a baseball game on Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco Giants left fielder Xavier Nady makes a diving attempt at a pop fly from Arizona Diamondbacks' John McDonald during the fourth inning of a baseball game on Wednesday, Sept. 5, 2012, in San Francisco. McDonald was awarded a single and drove in a run on the play. (AP Photo/Marcio Jose Sanchez)

San Francisco Giants' Marco Scutaro, right, walks back to the dugout after an at-bat against the Arizona Diamondbacks as a rainbow appears in the sky during the first inning of a baseball game on Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco Giants starting pitcher Madison Bumgarner throws to the Arizona Diamondbacks during the first inning of a baseball game on Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

Arizona Diamondbacks' Chris Johnson drives in two runs with a double against the San Francisco Giants during the seventh inning of a baseball game, Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

Arizona Diamondbacks' Chris Johnson drives in two runs with a double against the San Francisco Giants during the seventh inning of a baseball game, Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco Giants' Brandon Belt drives in two runs with a bases loaded single against the Arizona Diamondbacks during the seventh inning of a baseball game on, Wednesday, Sept. 5, 2012 in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco Giants third baseman Pablo Sandoval, left, is held back by third base umpire Greg Gibson as he argues with Arizona Diamondbacks' John McDonald, right, being held back by third base coach Matt Williams, second from left, after McDonald and Sandoval collided on a ground ball by Adam Eaton during the eighth inning of a baseball game on, Wednesday, Sept. 5, 2012 in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco Giants' Marco Scutaro, right, walks back to the dugout after an at-bat against the Arizona Diamondbacks as a rainbow appears in the sky during the first inning of a baseball game on Wednesday, Sept. 5, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

The Arizona Diamondbacks celebrate a 6-2 win over the San Francisco Giants during a baseball game on, Wednesday, Sept. 5, 2012 in San Francisco. (AP Photo/Marcio Jose Sanchez)

Arizona Diamondbacks starter Trevor Cahill makes an off balance throw to first base on a ground ball by San Francisco Giants' Buster Posey during the seventh inning of a baseball game on, Wednesday, Sept. 5, 2012 in San Francisco. Posey was safe at first base with an infield single. (AP Photo/Marcio Jose Sanchez)

San Francisco Giants third baseman Pablo Sandoval, left, collides with Arizona Diamondbacks' John McDonald as he is tagged out after a ground ball by Adam Eaton during the eighth inning of a baseball game on, Wednesday, Sept. 5, 2012 in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco Giants third baseman Pablo Sandoval, left, is held back by third base umpire Greg Gibson as he argues with Arizona Diamondbacks' John McDonald, right, being held back by third base coach Matt Williams, second from left, after McDonald and Sandoval collided on a ground ball by Adam Eaton during the eighth inning of a baseball game on, Wednesday, Sept. 5, 2012 in San Francisco. (AP Photo/Marcio Jose Sanchez)

The Arizona Diamondbacks and San Francisco Giants benches clear after a collision between Giants third baseman Pablo Sandoval and Diamondbacks' John McDonald during the eighth inning of a baseball game on, Wednesday, Sept. 5, 2012 in San Francisco. (AP Photo/Marcio Jose Sanchez)

El antesalista venezolano Pablo Sandoval, de los Gigantes de San Francisco, es contenido por el al árbitro de tercera Greg Gibson mientras discute con John McDonald, derecha, de los Diamondbacks de Arizona, que es aguantado por el coach Matt Williams, al centro, luego de una colisión entre los dos jugadores en el octavo inning de un partido de las mayores el miércoles, 5 de septiembre del 2012. (Foto AP/Marcio Jose Sanchez)