Pete Alonso has done it again.

The Mets slugger crushed a solo homer in the second inning off the Phillies’ Aaron Nola on Tuesday, giving the Mets a 1-0 lead in Game 3 of the NLDS, sending the 40,000-plus fans at Citi Field into a frenzy.

Alonso mashed the first pitch of the half inning 385 feet to right field — and off the signage of the second deck at an impressive 108.1 mph.

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It marked Alonso’s third long ball in the playoffs, all of which have gone to right field.