WASHINGTON — It’s been a confounding season for Kodai Senga. On the one hand, his 2.58 ERA is nothing to scoff at, but he’s been bitten by injury and inconsistency and, like most of this Mets rotation, an inability to pitch past the fifth inning.

So, in a lot of ways, Wednesday’s performance against the Nationals was pretty predictable. But for a team finally gaining momentum after a brutal two-month stretch, it was nonetheless frustrating.

Senga labored against the cellar-dwelling Nationals, and the Mets’ lineup came up one big hit short of a go-ahead rally as they fell, 5-4, at Nationals Park. The loss snapped a three-game winning streak.

Senga allowed five runs (four earned) and six hits with two walks and four strikeouts in five innings and the Mets, whose offense has been clicking

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