Pete Alonso picked just the right moment to awaken, resurrecting the Mets season along with him.

On the verge of extinction from the postseason, Alonso’s potential final at-bat in a Mets uniform instead turned into his biggest moment yet with the organization.

Alonso hit a three-run homer in the ninth inning against Milwaukee closer Devin Williams, catapulting the Mets to a 4-2 victory over the Brewers in Game 3 of the NL Wild Card Series at American Family Field.

The Mets, who won their first postseason series since 2015, got the final three outs from David Peterson and advanced to the NLDS beginning on Saturday in Philadelphia.

Held to two hits over the first eight innings, the Mets erupted in the ninth against Williams. 

Francisco Lindor walked and Brandon Nimmo singled with one out before Alonso, who is eligible for free agency after the season, cleared the right-field fence.