Chicago Cubs starting pitcher Jeff Samardzija throws against the Pittsburgh Pirates in the second inning of a baseball game Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates starting pitcher James McDonald throw to first on a pick-off attempt in the third inning of the baseball game against the Chicago Cubs on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Tony Campana dives as he advance from first to third on a single by David DeJesus during a baseball game against the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Alfonso Soriano rounds the bases in front of Pittsburgh Pirates shortstop Clint Barmes after hitting a solo home run in the second inning of a baseball game Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates shortstop Brock Holt, top, hops over Chicago Cubs' David DeJesus as he relays the throw to first to complete a double play on Luis Valbuena in the third inning of a baseball game Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija, left, runs down Pittsburgh Pirates' Jeff Samardzija to tag him out after he was caught between second and third on a ground ball by Alex Presley in the fourth inning of the baseball game Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates shortstop Brock Holt, left, tags Chicago Cubs' Starlin Castro, who stole second in the fourth inning of a baseball game Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Welington Castillo, top, slides behind Pittsburgh Pirates catcher Michael McKenry as he scores on a hit by David DeJesus in the eighth inning of a baseball game Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates relief pitcher Jason Grilli, left, watches as Chicago Cubs' Welington Castillo rolls after he scored on a hit by David DeJesus in the eighth inning of a baseball game Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Welington Castillo, left, slides past Pittsburgh Pirates catcher Michael McKenry as he scores on a hit by David DeJesus in the eighth inning of a baseball game Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' David DeJesus hits a single to drive in Welington Castillo with the go-ahead run in the eighth inning of s baseball game against the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. The Cubs won 4-3. (AP Photo/Keith Srakocic)

El dominicano Welington Castillo, izquierda, de los Cachorros de Chicago, se barre para superar al receptor de los Piratas de Pittsburgh para anotar con sencillo de David DeJesus en el octavo episodio del partido del sábado 8 de septiembre de 2012, en Pittsburgh. Los Cachorros ganaron 4-3. (Foto AP/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija, right, hugs catcher Welington Castillo after a baseball game against the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. Samardzija threw a complete game as the Cubs beat the Pirates 4-3. AP Photo/Keith Srakocic)

Chicago Cubs' Jeff Samardzija bunts in the sixth inning of the baseball game against the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija, left, runs down Pittsburgh Pirates' Pedro Alvarez to tag him out after he was caught between second and third on a ground ball by Alex Presley in the fourth inning of the baseball game on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija throws against the Pittsburgh Pirates in the sixth inning of the baseball game on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates relief pitcher Jason Grilli, left, watches as Chicago Cubs' Welington Castillo rolls after he sliid and scored on a hit by David DeJesus in the eighth inning of the baseball game on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates shortstop Brock Holt, top, hops over Chicago Cubs' David DeJesus as he relays the throw to first to complete a double play on Luis Valbuena in the third inning of the baseball game on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates starting pitcher James McDonald throws against the Chicago Cubs in the third inning of the baseball game on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija throws against the Pittsburgh Pirates in the third inning of the baseball game on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Alfonso Soriano, right is greeted by teammates as he returns to the dugout after hitting a home run in the second inning of the baseball game against the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Joe Mather (21) and Tony Campana (1) leap in celebration after the last out in the ninth inning of the baseball game against the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. The Cubs won 4-3. AP Photo/Keith Srakocic)

Pittsburgh Pirates' Josh Harrison (5) dashes past Chicago Cubs starting pitcher Jeff Samardzija (29) to score on a pinch hit by Jeff Clement in the seventh inning of the baseball game on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates' Josh Harrison (5) celebrates with on deck batter Brock Holt after scoring in the seventh inning on a pinch hit by Jeff Clement in the seventh inning of the baseball game on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs shortstop Starlin Castro makes a bad throw to first base allowing Pittsburgh Pirates' Rod Barajas to reach second on a ground ball in the seventhinning of the baseball game on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Welington Castillo (53) heads for home behind Pittsburgh Pirates catcher Michael McKenry as he scores on a hit by David DeJesus in the eighth inning of the baseball game on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates' Andrew McCutchen (22) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates' Andrew McCutchen (22) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates' Andrew McCutchen (22) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Starlin Castro (13) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Starlin Castro (13) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Starlin Castro (13) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Alfonso Soriano (12) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' Alfonso Soriano (12) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates relief pitcher Tony Watson (44) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates relief pitcher Tony Watson (44) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates relief pitcher Tony Watson (44) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates relief pitcher Tony Watson (44) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs third baseman Luis Valbuena (24) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates' Andrew McCutchen (22) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates third baseman Pedro Alvarez (24) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates third baseman Pedro Alvarez (24) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates third baseman Pedro Alvarez (24) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates third baseman Pedro Alvarez (24) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija (29) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija (29) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija (29) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija (29) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija (29) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija (29) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija (29) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates' Josh Harrison (5) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs starting pitcher Jeff Samardzija (29) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs third baseman Luis Valbuena (24) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates third baseman Pedro Alvarez (24) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Pirates third baseman Pedro Alvarez (24) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Chicago Cubs' David DeJesus (9) plays in the baseball game between the Chicago Cubs and the Pittsburgh Pirates on Saturday, Sept. 8, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)