Triston Casas, right, celebrates with third-base coach Carlos Febles after hitting his second home run of the game Saturday night in an 8-6 win over the New York Mets at Fenway Park. Michael Dwyer/Associated Press

BOSTON — Triston Casas had his first career multihomer game, and Yu Chang and Jarren Duran also homered off Max Scherzer in the night game on Saturday to help the Red Sox beat the New York Mets 8-6 and spilt their doubleheader.

Brandon Nimmo and Daniel Vogelbach each hit a two-run homer for the Mets before the rains came on Friday night when the series opener was suspended in the fourth inning. After they picked things up on Saturday afternoon, the teams traded runs and New York held for a 5-4 victory.

Casas had four hits on the day, and Masataka Yoshida had three in the night game, including an RBI single in the seventh just before Justin Turner’s two-run homer gave Boston an 8-3 lead.

James Paxton (6-2) struck out seven in six innings as Boston snapped a three-game losing streak. Scherzer was charged with five runs while striking out seven; it’s the first time he’s allowed four homers in an outing since his 2021 season debut.

A healthy portion of the two sellout crowds was rooting for the visitors, trying to drown out the “Let’s Go Red Sox!” chants with shouts of “Let’s Go Mets!” Unable to settle things, both sides joined together for a familiar chant razzing the last-place Yankees.

They saw Boston open a 2-0 lead in the night game when Duran and Casas led off the first and second innings with homers. The Mets took the lead in the fourth, as Jeff McNeil hit a two-run single and came all the way around to score when Red Sox catcher Jorge Alfaro threw the ball into deep center field in attempt to get McNeil at second base.

Pete Alonso had four hits on the day, including a ninth-inning triple in the night game as New York scored three to cut the deficit to 8-6. Kenley Jansen got the last out for his 21st save.

NOT QUITE A FULL DOUBLEHEADER

Friday night’s game was suspended in the bottom of the fourth inning when torrential rains began with one out, a 1-2 count on Alex Verdugo and the Mets leading 4-3. New York made it 5-3 after the game resumed when Alonso doubled and scored on Brett Baty’s single.

Boston cut the deficit to 5-4 when Casas tripled on a ball that got past right fielder Mark Canha, then scored on a sacrifice fly.

Grant Hartwig (3-1) started the resumed game and worked two scoreless innings for the win before David Robertson pitched the ninth for his 14th save.

Friday night starter Kutter Crawford (4-5) took the loss for Boston.

TRAINER’S ROOM

Red Sox: Boston placed right-hander Brayan Bello on the paternity list.