Washington Nationals

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Baltimore Orioles' Derrek Lee (25) is safe at second base as he collides with Washington Nationals second baseman Danny Espinosa while advancing on a throwing error by third baseman Ryan Zimmerman during the second inning of a baseball game in Washington, Sunday, June 19, 2011. (AP Photo/Ann Heisenfelt)

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Washington Nationals' Jerry Hairston, left, and Roger Bernadina celebrate after beating the Baltimore Orioles 8-4 in an interleague baseball game in Washington, Friday, June 17, 2011. (AP Photo/Ann Heisenfelt)

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Washington Nationals' Danny Espinosa, top right, leaps into a pile of teammates after hitting a walk-off home run off St. Louis Cardinals reliever Fernando Salas during the 10th inning of a baseball game in Washington, Thursday, June 16, 2011. The Nationals beat the Cardinals 7-4. (AP Photo/Ann Heisenfelt)

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Washington Nationals slugger Michael Morse has signed a multiyear extension with the team. He batted .303 with 31 home runs and 95 RBI last season. (AP Photo/Ann Heisenfelt)

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Washington Nationals' Mike Morse has been a force at the plate and at first base. Morse is batting over .300 and has 12 home runs on the year. (AP Photo/Ben Margot)

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Washington Nationals first baseman Adam LaRoche will have season-ending shoulder surgery. In 43 games this season, LaRoche hit .172 with two home runs and 15 RBI. (Associated Press)

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Washington Nationals third baseman Ryan Zimmerman gets ready to take batting practice prior to a baseball game against the St. Louis Cardinals in Washington, Tuesday, June 14, 2011. Zimmerman was reinstated Tuesday from the disabled list after missing 58 games because of an injured abdominal muscle. (AP Photo/Ann Heisenfelt)

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Washington Nationals third baseman Ryan Zimmerman tosses his bat after striking out during the first inning against the New York Mets in a spring training baseball game, Tuesday, March 1, 2011, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals' pitcher Livan Hernandez has links to drug kingpin Angel Ayala-Vazquez and his associates, court documents in Puerto Rico show. (Associated Press)

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Washington Nationals' John Lannon threw 6 1/3 innings and allowed one run in the Nats' 2-1 victory over the San Diego Padres. (AP Photo/Chris Park)

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Washington Nationals starting pitcher Livan Hernandez sits on the mound after being knocked down while catching a line drive hit by San Diego Padres' Chris Denorfia in the third inning of a baseball game, Thursday, June 9, 2011 in San Diego. (AP Photo/Lenny Ignelzi)

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Washington Nationals starter Livan Hernandez gave up six earned runs in 5 1/3 innings in the 7-3 loss to the San Diego Padres. (AP Photo/Lenny Ignelzi)

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Washington Nationals shortstop Ian Desmond has improved his defense significantly this season. The Nats also have 23 fewer errors than they did at this point in the season last year. (AP Photo/Jeff Roberson)

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Giants catcher Eli Whiteside celebrates with starting pitcher Matt Cain after Wednesday's victory against the Nationals in San Francisco. (Associated Press)

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Washington Nationals' Jordan Zimmermann works against the San Francisco Giants during the first inning of a baseball game Tuesday, June 7, 2011, in San Francisco. (AP Photo/Ben Margot)

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Washington Nationals' Jordan Zimmermann lays down an RBI sacrifice bunt against the San Francisco Giants during the fourth inning that proved to be the winning run in the 2-1 Nationals' victory. Zimmermann was also strong on the mound, throwing seven innings and allowing one run. (AP Photo/Ben Margot)

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Washington Nationals player Jerry Hairston, Jr., (left) walks with Monea Grier, 13, after having a catch during the Washington Nationals Youth Baseball Academy groundbreaking ceremony Tuesday at Fort DuPont Park in Southeast. (Rod Lamkey Jr./The Washington Times)