Clay Holmes aced his half of the equation, but his tag-team partner wasn’t as successful Sunday.

Sean Manaea had a shaky three-inning start, surrendering all of the runs in the Mets’ 3-2 loss to the Nationals at Citi Field.

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The lefty allowed four hits, the biggest of which was Nasim Nuñez’s two-run homer in the second inning.

“I thought the life on the fastball was there, but he just wasn’t able to elevate it,” manager Carlos Mendoza said. “They got him any time he came in the strike zone.”

It was a step backward for Manaea, following his relief appearance Tuesday against the Padres in which he all

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