Ben Bernanke, chairman of the Federal Reserve, stands on the field before a baseball game between the Washington Nationals and the Miami Marlins at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals' Bryce Harper, center right, poses for a photograph with Kisha Lee, from Centerville, Va., before a baseball game against the Miami Marlins at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals general manager Mike Rizzo makes a phone call on the field before a baseball game against the Miami Marlins at Nationals Park Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals third baseman Ryan Zimmerman, left, and first baseman Adam LaRoche, center, greet Ben Bernanke, chairman of the Federal Reserve, before a baseball game against the Miami Marlins at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Major League Baseball official Joe Torre, left, talks with Washington Nationals manager Davey Johnson before a baseball game against the Miami Marlins at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals starting pitcher Stephen Strasburg wipes his face on the mound during the second inning of a baseball game against the Miami Marlins at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals starting pitcher Stephen Strasburg throws during the second inning of a baseball game against the Miami Marlins at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals starting pitcher Stephen Strasburg throws during the second inning of a baseball game against the Miami Marlins at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Miami Marlins starting pitcher Jacob Turner throws during the first inning of a baseball game against the Washington Nationals at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals starting pitcher Stephen Strasburg throws during the first inning of a baseball game against the Miami Marlins at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals first baseman Adam LaRoche (25) catches a ball hit by Miami Marlins' Carlos Lee over the head of second baseman Danny Espinosa, with right fielder Jayson Werth looking on, during the first inning of a baseball game at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Miami Marlins' Rob Brantly (19) celebrates his solo home run with teammates during the second inning of a baseball game against the Washington Nationals at Nationals Park, Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Miami Marlins second baseman Donovan Solano catches a ball hit by Washington Nationals' Michael Morse during the fourth inning of a baseball game at Nationals Park, Friday, Sept. 7, 2012, in Washington. The Marlins won in 10 innings. (AP Photo/Alex Brandon)

Miami Marlins' Jose Reyes, center, celebrates with third base coach Joey Espada, left, after hitting an RBI-triple during the fourth inning of a baseball game against the Washington Nationals at Nationals Park Friday, Sept. 7, 2012, in Washington. The Marlins won 9-7 in 10 innings. (AP Photo/Alex Brandon)

Washington Nationals catcher Kurt Suzuki, top, reacts after making the tag on Miami Marlins' Greg Dobbs after Dobbs attempted to come home on a Rob Brantly sacrifice fly to center field during the ninth inning of a baseball game at Nationals Park, Friday, Sept. 7, 2012, in Washington. The Marlins won 9-7 in 10 innings. (AP Photo/Alex Brandon)

Stephen Strasburg, abridor de los Nacionales de Washington, se seca el sudor durante el encuentro del viernes 7 de septiembre de 2012 frente a los Marlins de Florida (AP Foto/Alex Brandon)

Washington Nationals catcher Kurt Suzuki, left, prepares to make the tag on Miami Marlins' Greg Dobbs who was attempting to come home on a Rob Brantly sacrifice fly to center field during the ninth inning of a baseball game at Nationals Park, Friday, Sept. 7, 2012, in Washington. The Marlins won 9-7 in 10 innings. (AP Photo/Alex Brandon)

Washington Nationals' Michael Morse (38) celebrates as he rounds the bases for his solo home run during the eighth inning of a baseball game against the Miami Marlins at Nationals Park, Friday, Sept. 7, 2012, in Washington. The Marlins won 9-7 in 10 innings. (AP Photo/Alex Brandon)

Washington Nationals' Kurt Suzuk, right,i celebrates with Jayson Werth after scoring during the seventh inning of a baseball game at Nationals Park, Friday, Sept. 7, 2012, in Washington. The Marlins won 9-7 in 10 innings. (AP Photo/Alex Brandon)

El dominicano José Reyes, de los Marlins de Miami, festeja arrodillado con el coach de la antesala Joey Espada, luego de conectar un triple productor contra los Nacionales de Washington, el viernes 7 de septiembre de 2012 (AP Foto/Alex Brandon)

Miami Marlins' Gorkys Hernandez (2) and Jose Reyes (7) celebrate after Reyes scored during the 10th inning of a baseball game against the Washington Nationals at Nationals Park on Friday, Sept. 7, 2012, in Washington. The Marlins won 9-7 in 10 innings. (AP Photo/Alex Brandon)

Washington Nationals starting pitcher Stephen Strasburg reacts during the first inning of a baseball game against the Miami Marlins at Nationals Park Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals starting pitcher Stephen Strasburg, left, walks to the dugout with catcher Kurt Suzuki before a baseball game against the Miami Marlins at Nationals Park Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals starting pitcher Stephen Strasburg, right, reacts with his teammates before a baseball game against the Miami Marlins at Nationals Park Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Washington Nationals' Kurt Suzuki celebrates after scoring during the seventh inning of a baseball game against the Miami Marlins at Nationals Park Friday, Sept. 7, 2012, in Washington. The Marlins won in 10 innings. (AP Photo/Alex Brandon)

Miami Marlins' Greg Dobbs reacts at home plate after he attempted to come home on the Rob Brantly sacrifice fly to center field, but was tagged out by Washington Nationals catcher Kurt Suzuki, during the ninth inning of a baseball game at Nationals Park Friday, Sept. 7, 2012, in Washington. The Marlins won in 10 innings. (AP Photo/Alex Brandon)

Washington Nationals starting pitcher Stephen Strasburg wipes his face during the second inning a baseball game against the Miami Marlins at Nationals Park Friday, Sept. 7, 2012, in Washington. (AP Photo/Alex Brandon)

Miami Marlins' Jose Reyes hits a two=RBI triple during the 10th inning of a baseball game against the Washington Nationals at Nationals Park, Friday, Sept. 7, 2012, in Washington. The Marlins won 9-7 in 10 innings. (AP Photo/Alex Brandon)

El pitcher de los Nacionales de Washington, Stephen Strasburg, lanza contra los Marlins de Florida el viernes, 7 de septiembre de 2012, en Washington. (AP Photo/Alex Brandon)