Washington Nationals right fielder Bryce Harper (34) watches the ball after hitting a second home run against the Miami Marlins during the third inning of their baseball game at Nationals Park in Washington, Wednesday, May 6, 2015. (AP Photo/Susan Walsh)
Washington Nationals starting pitcher Stephen Strasburg (37) throws during the first inning of a baseball game against the Miami Marlins at Nationals Park, Tuesday, May 5, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals relief pitcher Tanner Roark (57) celebrates a 6-4 win over the Miami Marlins with catcher Wilson Ramos (40) in a baseball game Monday, May 4, 2015, in Washington. (AP Photo/Nick Wass)
Washington Nationals' Yunel Escobar dives back to first as he was safe on a single during the third inning of a baseball game against the Miami Marlins, Monday, May 4, 2015, in Washington. (AP Photo/Nick Wass)
Washington Nationals starting pitcher Doug Fister delivers in the second inning of a baseball game against the New York Mets in New York, Sunday, May 3, 2015. (AP Photo/Kathy Willens)
Washington Nationals catcher Wilkson Ramos (40) celebrates with Nationals relief pitcher Drew Storen (22) after Storen closed out the Nationals 8-2 victory over the New York Mets in a baseball game in New York, Thursday, April 30, 2015. (AP Photo/Kathy Willens)
Washington Nationals' Dan Uggla (26) follows through on a three-run home run in the ninth inning of a baseball game against the Atlanta Braves Tuesday, April 28, 2015, in Atlanta. Washington won 13-12. (AP Photo/John Bazemore)
Washington Nationals' Dan Uggla (26) follows through on a three-run home run in the ninth inning of a baseball game against the Atlanta Braves Tuesday, April 28, 2015, in Atlanta. Washington won 13-12. (AP Photo/John Bazemore)
Washington Nationals starting pitcher Stephen Strasburg prepares to deliver in the first inning of a baseball game against the Miami Marlins, Saturday, April 25, 2015, in Miami. (AP Photo/Lynne Sladky)
Miami Marlins manager Mike Redmond, left, gives a high-five to Ichiro Suzuki (51) after the team's 3-2 win against the Washington Nationals in a baseball game, Friday, April 24, 2015, in Miami. (AP Photo/Alan Diaz)
Washington Nationals starting pitcher Max Scherzer delivers a pitch against the St. Louis Cardinals during the first inning of a baseball game, Thursday, April 23, 2015, in Washington. (AP Photo/Nick Wass)
St. Louis Cardinals' Kolten Wong (16) celebrates his two-run home run with Yadier Molina (4) during the second inning of a baseball game against the Washington Nationals, Wednesday, April 22, 2015, in Washington. (AP Photo/Nick Wass)
St. Louis Cardinals' Matt Carpenter (13) rounds third as he heads home on a home run as Washington Nationals third baseman Yunel Escobar (5) watches during the first inning of a baseball game, Wednesday, April 22, 2015, in Washington. (AP Photo/Nick Wass)
Washington Nationals' Anthony Rendon, right, stretches during a spring training baseball workout, Wednesday, Feb. 25, 2015, in Viera, Fla. (AP Photo/David Goldman)
Washington Nationals' Yunel Escobar celebrates the game winning solo home run as he slides into home during the 10th inning of a baseball game against the St. Louis Cardinals at Nationals Park, Tuesday, April 21, 2015, in Washington. The Nationals won 2-1, in 10 innings. (AP Photo/Alex Brandon)
Washington Nationals' Yunel Escobar waves to the fans as he heads to the clubhouse after his game winning solo home run in the 10th inning of a baseball game against the St. Louis Cardinals at Nationals Park, Tuesday, April 21, 2015, in Washington. The Nationals won 2-1, in 10 innings. (AP Photo/Alex Brandon)
Washington Nationals starting pitcher Stephen Strasburg throws during the first inning of a baseball game against the Philadelphia Phillies at Nationals Park, Sunday, April 19, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals' Bryce Harper hits a solo home run during the fifth inning of a baseball game against the Philadelphia Phillies at Nationals Park, Saturday, April 18, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals relief pitcher Craig Stammen (35) throws during the baseball home opener against the Atlanta Braves at Nationals Park Friday, April 4, 2014, in Washington. The Atlanta Braves defeated the Nationals 2-1. (AP Photo/Alex Brandon)
Washington Nationals' Michael Taylor watches his solo home run during the fifth inning of a baseball game against the Philadelphia Phillies at Nationals Park, Thursday, April 16, 2015, in Washington. (AP Photo/Alex Brandon)