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It was the two-out, two-strike hanging slider that Edwin Jackson, making his Nationals debut, failed to execute in the fourth inning that Nieuwnehuis dumped over the newly-shortened Citi Field fence in right field.

“It’s one of those where we need to learn from our mistakes,” Zimmerman said. “We didn’t execute late in the game. Hopefully by July and August, we won’t be making the same mistakes.”