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    In the weeks since, Devers’ refusal to play first led to internal tension and helped facilitate the deal, sources said.

    San Francisco pounced — and added a force to an offense that ranks 15th in runs scored in Major League Baseball. Devers, 28, is hitting .272/.401/.504 with 15 home runs and 58 RBIs, tied for the third most in MLB. Over his nine-year career, Devers is hitting .279/.349/.509 with 215 home runs and 696 RBIs in 1,053 games.

    Boston believed enough in Devers to give him a 10-year, $313.5 million contract extension in January 2023. He rewarded the Red Sox with a Silver Slugger Award that season and made his third All-Star team in 2024.

    Whether he slots in at designated hitter or first base with San Francisco — the Giants signed Gold Glove third baseman Matt Chapman to a six-year, $151 million deal last year — is unknown. But San Francisco sought Devers more for his bat, one that immediately makes the Giants — who are fighting for National League West supremacy with the Los Angeles Dodgers — a better team.

    To do so, the Giants gave a package of young talent and took on the contract that multiple teams’ models had as underwater.

    Harrison, 23, is the prize of the deal, particularly for a Red Sox team replete with young hitting talent but starving for young pitching. Once considered one of the best pitching prospects in baseball, Harrison has shuttled between San Francisco and Triple-A Sacramento this season.

    Harrison, who was scratched from a planned start against the Dodgers on Sunday night, has a 4.48 ERA over 182⅔ innings since debuting with the Giants in 2023. He has struck out 178, walked 62 and allowed 30 home runs. The Red Sox optioned Harrison to Triple-A Worcester after the trade was announced.

    Hicks, 28, who has toggled between starter and reliever since signing with the Giants for four years and $44 million before the 2024 season, is on the injured list because of right toe inflammation. One of the hardest-throwing pitchers in baseball, Hicks has a 6.47 ERA over 48⅔ innings this season. He could join the Red Sox’s ailing bullpen, which Breslow has sought to upgrade.

    Tibbs, 22, was selected by the Giants with the 13th pick in last year’s draft out of Florida State. A 6-foot, 200-pound corner outfielder, Tibbs has spent the season at High-A, where he has hit .245/.377/.480 with 12 home runs and 32 RBIs in 56 games. Scouts laud his command of the strike zone — he has 41 walks and 45 strikeouts in 252 plate appearances — but question whether his swing will translate at higher levels.

    Bello, 20, has spent the season as a reliever for the Giants’ Rookie League affiliate. In 18 innings, he has struck out 28 and walked three while posting a 2.00 ERA.

    The deal is the latest in which Boston shipped a player central to the franchise.

    Boston traded Mookie Betts to the Dodgers in February 2020, just more than a year after leading Boston to a franchise-record 108 wins and a World Series title and winning the American League MVP Award.

    Devers was part of that World Series-winning team in 2018 and led the Red Sox in RBIs each season from 2020 to 2024, garnering AL MVP votes across each of the past four years. Devers had been with the Red Sox since 2013, when he signed as an international amateur free agent out of the Dominican Republic. He debuted four years later at age 20.

    Boston is banking on its young talent to replace Devers’ production. The Red Sox regularly play four rookies — infielders Kristian Campbell and Marcelo Mayer, outfielder Roman Anthony and catcher Carlos Narvaez — and infielder Franklin Arias and outfielder Jhostynxon Garcia are expected to contribute in the coming years.