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Dallas Keuchel unleashes a pitch in the first inning.

Karen Warren / Houston Chronicle

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Bryce Harper at bat during the first inning.

Edwin Jackson pitches in the first inning.

Jackson struck out eight in 5 1/3 innings.

Jayson Werth watches Marwin Gonzalez's ball leave the park on a solo home run during the first inning.

Marwin Gonzalez fields a ground out hit by Washington Nationals catcher Kurt Suzuki during the second inning.

Jordan Schafer grabs a pop up hit by Bryce Harper during the third inning.

Jose Altuve strikes out during the third inning.

Brett Wallace reacts as he strikes out during the third inning.

Ryan Zimmerman celebrates his run scored with Washington Nationals right fielder Jayson Werth after he was batted in by first baseman Adam LaRoche.

Dallas Keuchel chats with catcher Carlos Corporan after Washington Nationals first baseman Adam LaRoche's RBI single during the fourth inning.

Washington Nationals third baseman Ryan Zimmerman hits his RBI single which scored two runs during the fifth inning.

Bryce Harper celebrates his run scored with right fielder Jayson Werth on an RBI single by third baseman Ryan Zimmerman during the fifth inning.

Dallas Keuchel fixes his hat during the fifth inning.