Washington Nationals

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Washington Nationals starting pitcher Gio Gonzalez (47) celebrates with his teammates after his solo home run during the fifth inning of a baseball game against the Miami Marlins at Nationals Park on Wednesday, April 3, 2013, in Washington. (AP Photo/Alex Brandon)

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Washington Nationals starting pitcher Gio Gonzalez acknowledges the crowd after his solo home run during the fifth inning of a baseball game against the Miami Marlins at Nationals Park Wednesday, April 3, 2013, in Washington. (AP Photo/Alex Brandon)

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Washington Nationals outfielder Bryce Harper, pictured here with Thomas Tull, one of the producers of '42,' attended a reception at the White House on Tuesday to meet President Obama and screen the move, which is about Jackie Robinson breaking the color barrier in baseball. (Alba V. Tull photo)

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New York Yankees relief pitcher Mariano Rivera, center raises his cap during a presentation before an exhibition baseball game at Nationals Park on Friday, March 29, 2013, in Washington. Washington Nationals relief pitcher Rafael Soriano is at left, (AP Photo/Alex Brandon)

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Fans rejoice as the Washington Nationals beat the the Miami Marlins on opening day, at Nationals Park, in Washington, DC., Monday, April 1, 2013. (Andrew S Geraci/The Washington Times)

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Washington Nationals left fielder Bryce Harper (34), center, celebrate with teammates as the Washington Nationals beat the Miami Marlins 2-0 on opening day at Nationals Park, Washington, D.C., Monday, April 1, 2013. (Andrew Harnik/The Washington Times)

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Washington Nationals relief pitcher Rafael Soriano (29) celebrates with Washington Nationals catcher Wilson Ramos (40) as the Washington Nationals beat the Miami Marlins 2-0 on opening day at Nationals Park, Washington, D.C., Monday, April 1, 2013. (Andrew Harnik/The Washington Times)

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Washington Nationals left fielder Bryce Harper (34) takes the field with teammates to play the Miami Marlins on opening day at Nationals Park, Washington, D.C., Monday, April 1, 2013. (Andrew Harnik/The Washington Times)

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Metal of Honor recipient Clint Romesha is given a ball by Washington Nationals starting pitcher Gio Gonzalez (47) after throwing out the first pitch before the Washington Nationals play the Miami Marlins on opening day at Nationals Park, Washington, D.C., Monday, April 1, 2013. (Andrew Harnik/The Washington Times)

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Washington Nationals players laugh together as they wait to take the field to play the Miami Marlins on opening day at Nationals Park, Washington, D.C., Monday, April 1, 2013. (Andrew Harnik/The Washington Times)