Washington Nationals starting pitcher Stephen Strasburg (37) throws during the fourth inning of a baseball game against the San Francisco Giants at Nationals Park, Saturday, July 4, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals' Bryce Harper (34) watches his two-run homer as he holds his Independence Day themed bat during the first inning of a baseball game against the San Francisco Giants at Nationals Park, Saturday, July 4, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals starting pitcher Stephen Strasburg (37) throws during the first inning of a baseball game against the San Francisco Giants at Nationals Park, Saturday, July 4, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals starting pitcher Max Scherzer works in the first inning of a baseball game against the Atlanta Braves on Thursday, July 2, 2015, in Atlanta. (AP Photo/John Bazemore)
Atlanta Braves' A.J. Pierzynski (15) follows through on a two-run home run as Washington Nationals catcher Wilson Ramos (40) looks on in the fourth inning of Wednesday's game in Atlanta. (Associated Press)
Washington Nationals first baseman Clint Robinson (25) is congratulated by third base coach Bob Henley (14) as he rounds third base after hitting a two-run home run in the first inning of a baseball game against the Atlanta Braves Tuesday, June 30, 2015, in Atlanta. (AP Photo/John Bazemore)
Washington Nationals starting pitcher Stephen Strasburg (37) wraps his arm after pitching against the Los Angeles Dodgers during the second inning of a baseball game against the Los Angeles Dodgers, in his first major league start since undergoing Tommy John surgery, at Nationals Park in Washington, on Tuesday, Sept. 6, 2011. (AP Photo/Jacquelyn Martin)
Washington Nationals' Denard Span, right, scores past Philadelphia Phillies catcher Cameron Rupp on a sacrifice fly by Danny Espinosa during the fifth inning of the first game of a baseball doubleheader, Sunday, June 28, 2015, in Philadelphia. Washington won 3-2. (AP Photo/Matt Slocum)
Washington Nationals starting pitcher Doug Fister throws during the first inning of a baseball game against the Atlanta Braves at Nationals Park, Thursday, June 25, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals starting pitcher Jordan Zimmermann throws during the fourth inning of a baseball game against the Atlanta Braves at Nationals Park, Wednesday, June 24, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals' Bryce Harper (34) celebrates his two-run homer with his teammates during the first inning of a baseball game against the Pittsburgh Pirates at Nationals Park, Sunday, June 21, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals starting pitcher Max Scherzer (31) throws during the third inning of a baseball game against the Pittsburgh Pirates, Saturday, June 20, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals right fielder Bryce Harper sits in the dugout during a baseball game against the Pittsburgh Pirates, Friday, June 19, 2015, in Washington. Harper injured his leg Thursday. (AP Photo/Alex Brandon)
Washington Nationals right fielder Bryce Harper (34) leaves the field with head athletic trainer Lee Kuntz, rear, during the sixth inning of Thursday night's game against the Tampa Bay Rays at Nationals Park in Washington. (Associated Press)
Washington Nationals right fielder Bryce Harper (34) pauses in the dugout before a baseball game against the Tampa Bay Rays at Nationals Park, Wednesday, June 17, 2015, in Washington. (AP Photo/Alex Brandon)
Tampa Bay Rays starting pitcher Steven Geltz (54) throws during the first inning of a baseball game against the Washington Nationals at Nationals Park, Wednesday, June 17, 2015, in Washington. (AP Photo/Alex Brandon)
Tampa Bay Rays' David DeJesus, left, and Chris Archer, right, douse Steven Souza Jr. after a baseball game against the Washington Nationals at Nationals Park, Wednesday, June 17, 2015, in Washington. The Rays won 5-0. (AP Photo/Alex Brandon)
Washington Nationals' Bryce Harper (34) talks to home plate umpire Jim Reynolds after being called out on strikes during the first inning of a baseball game against the Tampa Bay Rays Monday, June 15, 2015, in St. Petersburg, Fla. (AP Photo/Chris O'Meara)
Miami Marlins left fielder Ichiro Suzuki (51) in between pitches with Washington Nationals catcher Wilson Ramos (40) during the fourth inning of their baseball game at Nationals Park in Washington, Wednesday, May 6, 2015. (AP Photo/Susan Walsh)
Washington Nationals' Clint Robinson hits a two-run scoring double during the seventh inning of a baseball game against the Milwaukee Brewers, Sunday, June 14, 2015, in Milwaukee. (AP Photo/Morry Gash)