Pete Alonso golfed an early three-run homer and the New York Mets hammered an ineffective Jack Flaherty, extending the National League Championship Series with a 12-6 victory over the Los Angeles Dodgers in Game 5 on Friday.

Starling Marte had three doubles, four hits and three RBIs for New York. Francisco Alvarez broke out of a slump with three hits — including an RBI single in a five-run third inning. Francisco Lindor and Jesse Winker each laced an RBI triple.

After getting blown out in three of the first four games, including the past two nights at home, the wild-card Mets saved their season for the second time in these playoffs — both with the help of a three-run shot by Alonso. They trimmed their series deficit to 3-2 and sent the best-of-seven NLCS back to Los Angeles for Game 6 on Sunday.

Sean Manaea is expected to start for New York on five days' rest, while the Dodgers are likely to go with another bullpen game because of a thin rotation decimated by injuries.

With an opportunity to pitch his hometown team into the World Series, Flaherty flopped. After throwing seven shutout innings of two-hit ball in a Game 1 win, he fell behind 3-0 four batters in when Alonso launched a low slider 432 feet to centre field for his fourth homer this postseason.

Alonso, poised to become a prized free agent this fall, also connected on a go-ahead shot in the first inning with the Mets facing elimination in Game 3 of their Wild Card Series in Milwaukee. That one was more dramatic, coming with New York trailing 2-0 and down to its final two outs in the ninth.

Flaherty allowed eight runs and eight hits in three innings. He failed to strike out a batter for the first time since a September 2022 game with St. Louis against Pittsburgh.

After striking out 12 times Thursday night, the Mets did not whiff once in Game 5.

Handed an 8-1 lead, New York starter David Peterson was unable to make it through the fourth.

Dodgers rookie Andy Pages homered twice and drove in four runs. Mookie Betts went deep for the second consecutive game, helping Los Angeles cut an eight-run deficit to 10-6.

But then relievers Ryne Stanek and Edwin Diaz settled things down, and the Mets put this one away. Stanek worked a career-high 2 1/3 innings for the victory, and Diaz got six outs without permitting a run.