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Moore’s swing has remained jarringly absent, even, again, with a miniscule sample size. Of big league players with at least 100 plate appearances this season, Moore has the second-worst batting average (.151) and third-worst on-base percentage (.195). Also in that ignominious top three? Danny Espinosa.

Consistent at-bats to help Moore out of the funk haven’t been there as the team’s cloud of injuries has lifted and regulars returned. Hairston, though, is familiar with a limited role.

Adding the outfielder isn’t the difference between another pennant to hang in Nationals Park and a hangdog October. But the cost is low and Hairston shores up a key weakness on the 25-man roster. The Nationals are better today. This is a move winning teams make, a move that reminds us the pennant chase is far from over.