BOSTON — The Mets were ahead by one run, but still needed 17 outs from the bullpen as play resumed Saturday in their game against the Red Sox that had been suspended Friday night.

It sounded like a dicey proposition for a team that has weathered much turmoil from its relievers, particularly in the middle innings of games in which starters haven’t provided length.

Yet the Mets figured it out, with near optimal results from the five pitchers they deployed in finishing a 5-4 victory at Fenway Park.

The Mets won for the fourth time in five games, but were still five games below .500 as they prepared for the regularly scheduled game against the Red Sox, which had been shifted to Saturday night.

Grant Hartwig, David Peterson, Dominic Leone, Brooks Raley and David Robertson combined for those 4 ²/₃ innings, and only allowed one run.

The Mets also squeezed out one more run, enough to supplement a pair of two-run homers Brandon Nimmo and Daniel Vogelbach hit on Friday night before heavy rain stopped the game in the fourth inning and forced a suspension after nearly a two-hour delay.

Brett Baty’s infield single in the sixth inning on Saturday extended the Mets’ lead to 5-3.

Pete Alonso doubled off the Green Monster to start the inning and reached third on a wild pitch before Baty’s grounder, which was gloved in the shortstop hole by Yu Chang, brought in the run.

After Hartwig pitched two scoreless innings for the Mets in which he allowed one hit, Peterson escaped trouble in the sixth.

Rafael Devers’ single off second baseman Luis Guillorme’s chest put runners on the corners.

Guillorme departed the game after that play with a calf injury and manager Buck Showalter said after the game he likely would need to go on the injured list.

After Dever’s single, Peterson retired Adam Duvall and struck out Alex Verdugo to end the threat.

Mark Canha misplayed Triston Casas’ double into a triple leading off the seventh.

The ball rolled between Canha’s legs as he pursued it in the right-field corner. Chang’s sacrifice fly pulled the Red Sox within 5-4.

Leone recorded three outs in the inning after Peterson was removed following Casas’ triple.

The Mets wasted an opportunity to build a cushion in the eighth, when Baty hit into an inning-ending double play after three straight singles (two of them easily could have been errors charged to Justin Turner) with nobody out.

Kodai Senga had allowed three earned runs on three hits and a walk over 3 ¹/₃ innings before the game was suspended on Friday.

It snapped a stretch of three straight starts in which the right-hander had allowed fewer than three earned runs.

Jarren Duran’s stolen base and advancement to third on Francisco Alvarez’s throwing error helped the Red Sox take a 1-0 lead in the first on Justin Turner’s RBI groundout.

Chang’s two-run double in the second put the Mets in a 3-0 hole, but Senga retired the final five batters he faced.

Nimmo’s 14th homer of the season, a two-run shot in the third, began the Mets’ comeback against Kutter Crawford.

In the fourth, Vogelbach’s two-run homer gave the Mets a 4-3 lead.

Crawford allowed four earned runs on four hits over four innings with two strikeouts.