San Francisco Giants' Pablo Sandoval, bottom center, celebrates with teammates after hitting a two-run home run off of Washington Nationals pitcher Yunesky Maya during the tenth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. The Giants won 4-2 in 10 innings. (AP Photo/Jeff Chiu)

Washington Nationals pitcher Stephen Strasburg throws against the San Francisco Giants during the seventh inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

San Francisco Giants catcher Buster Posey (28) reacts after striking out against Washington Nationals pitcher Stephen Strasburg during the sixth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

San Francisco Giants' Gregor Blanco hits a triple off of Washington Nationals pitcher Rafael Soriano to score Andres Torres during the ninth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

Washington Nationals pitcher Stephen Strasburg throws during the first inning of a baseball game against the San Francisco Giants in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

Washington Nationals' Ian Desmond hits a double to score Ryan Zimmerman during the first inning of a baseball game against the San Francisco Giants in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

San Francisco Giants' Gregor Blanco, right, scores past Washington Nationals catcher Kurt Suzuki (24) during the second inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

San Francisco Giants' Pablo Sandoval celebrates after hitting a two-run home run off of Washington Nationals pitcher Yunesky Maya during the tenth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. The Giants won 4-2 in 10 innings. (AP Photo/Jeff Chiu)

San Francisco Giants pitcher Matt Cain throws against the Washington Nationals during the first inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

Washington Nationals pitcher Yunesky Maya walks off the mound after San Francisco Giants' Pablo Sandoval celebrates hit a two-run home run during the tenth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. The Giants won 4-2 in 10 innings. (AP Photo/Jeff Chiu)

SAN FRANCISCO, CA - MAY 21: Pablo Sandoval #48 of the San Francisco Giants rounds the bases after hitting a two run walk-off home run off of Yunesky Maya #31 of the Washington Nationals during the tenth inning at AT&T Park on May 21, 2013 in San Francisco, California. The San Francisco Giants defeated the Washington Nationals 4-2 in 10 innings. (Photo by Jason O. Watson/Getty Images)

San Francisco Giants' Pablo Sandoval celebrates after hitting a two-run home run off of Washington Nationals pitcher Yunesky Maya during the tenth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. The Giants won 4-2 in 10 innings. (AP Photo/Jeff Chiu)

San Francisco Giants' Pablo Sandoval celebrates after hitting a two-run home run off of Washington Nationals pitcher Yunesky Maya during the tenth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. The Giants won 4-2 in 10 innings. (AP Photo/Jeff Chiu)

San Francisco Giants' Pablo Sandoval, bottom center, celebrates with teammates after hitting a two-run home run off of Washington Nationals pitcher Yunesky Maya during the tenth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. The Giants won 4-2 in 10 innings. (AP Photo/Jeff Chiu)

San Francisco Giants' Gregor Blanco hits a triple off of Washington Nationals pitcher Rafael Soriano to score Andres Torres during the ninth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

San Francisco Giants' Andres Torres scores on a triple by Gregor Blanco during the ninth inning of a baseball game against the Washington Nationals in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

SAN FRANCISCO, CA - MAY 21: Andres Torres #56 of the San Francisco Giants celebrates after scoring the game tying run against the Washington Nationals during the ninth inning at AT&T Park on May 21, 2013 in San Francisco, California. (Photo by Jason O. Watson/Getty Images)

SAN FRANCISCO, CA - MAY 21: Denard Span #2 of the Washington Nationals celebrates after hitting a double against the San Francisco Giants during the eighth inning at AT&T Park on May 21, 2013 in San Francisco, California. (Photo by Jason O. Watson/Getty Images)

San Francisco Giants' Gregor Blanco celebrates after hitting a triple off of Washington Nationals pitcher Rafael Soriano to score Andres Torres during the ninth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

Washington Nationals pitcher Stephen Strasburg (37) high fives teammates in the dugout after finishing the seventh inning of a baseball game against the San Francisco Giants in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

San Francisco Giants catcher Buster Posey (28) reacts after striking out against Washington Nationals pitcher Stephen Strasburg during the sixth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

SAN FRANCISCO, CA - MAY 21: Gregor Blanco #7 of the San Francisco Giants calls for time after stealing second base in front of Ian Desmond #20 of the Washington Nationals during the fourth inning at AT&T Park on May 21, 2013 in San Francisco, California. (Photo by Jason O. Watson/Getty Images)

Washington Nationals pitcher Stephen Strasburg throws against the San Francisco Giants during the seventh inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

SAN FRANCISCO, CA - MAY 21: Buster Posey #28 of the San Francisco Giants talks to Matt Cain #18 on the pitcher's mound against the Washington Nationals during the fourth inning at AT&T Park on May 21, 2013 in San Francisco, California. (Photo by Jason O. Watson/Getty Images)

San Francisco Giants' Gregor Blanco, right, scores past Washington Nationals catcher Kurt Suzuki (24) during the second inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

SAN FRANCISCO, CA - MAY 21: Matt Cain #18 of the San Francisco Giants pitches against the Washington Nationals during the first inning at AT&T Park on May 21, 2013 in San Francisco, California. (Photo by Jason O. Watson/Getty Images)

SAN FRANCISCO, CA - MAY 21: Ryan Zimmerman #11 of the Washington Nationals is congratulated by manager Davey Johnson #5 after scoring a run against the San Francisco Giants during the first inning at AT&T Park on May 21, 2013 in San Francisco, California. (Photo by Jason O. Watson/Getty Images)

SAN FRANCISCO, CA - MAY 21: Denard Span #2 of the Washington Nationals is congratulated by Adam LaRoche #25 after scoring a run against the San Francisco Giants during the first inning at AT&T Park on May 21, 2013 in San Francisco, California. (Photo by Jason O. Watson/Getty Images)

SAN FRANCISCO, CA - MAY 21: Stephen Strasburg #37 of the Washington Nationals pitches against the San Francisco Giants during the first inning at AT&T Park on May 21, 2013 in San Francisco, California. (Photo by Jason O. Watson/Getty Images)

SAN FRANCISCO, CA - MAY 21: Ryan Zimmerman #11 of the Washington Nationals hits an RBI double off of Matt Cain (not pictured) of the San Francisco Giants during the first inning at AT&T Park on May 21, 2013 in San Francisco, California. (Photo by Jason O. Watson/Getty Images)