Casey Schmitt, Mike Yastrzemski and Willy Adames hit home runs, Heliot Ramos collected four RBIs and the San Francisco Giants outslugged the visiting Boston Red Sox for a 9-5 victory to compete a three-game series win Sunday afternoon.

Completing his first set of games against his former team, Rafael Devers contributed a hit, a walk and a run to the win, during which the Giants equaled their third-most runs in a home game this season.

Powered by homers by Rob Refsnyder (his fifth), Romy Gonzalez (second) and Ceddanne Rafaela (eighth), the Red Sox took a 5-4 lead into the last of the seventh inning before a costly error helped turn the tables.

A single by Adames and double by Schmitt set the stage for a one-out safety squeeze bunt by Tyler Fitzgerald that tied the score against Boston reliever Greg Weissert (2-2).

The Red Sox appeared to escape further damage when Yastrzemski hit a potential inning-ending grounder to Gonzalez at second, but he booted the ball, allowing Schmitt to score the go-ahead run.

Devers followed with a single before Ramos capped his big day with a two-run double into the right field corner, increasing the hosts’ lead to 8-5.

Erik Miller (4-0), the third Giants pitcher, was credited with the win after throwing a scoreless seventh. Tyler Rogers and Randy Rodriguez then allowed San Francisco to complete a 3-3 week with a shutout inning apiece.

Ramos’ first two RBIs occurred in the third on a single that gave the Giants a 2-1 lead.

Schmitt’s homer, his fourth of the season, was part of a 4-for-4 day in which he scored three times. Adames, who added his homer in the ninth, joined Ramos with two hits, while Yastrzemski (sixth homer) scored twice.

The homers by Refsnyder and Rafaela came as part of two-hit games. Carlos Narvaez, Abraham Toro and Nate Eaton also had two hits apiece as the Red Sox out-hit the Giants 12-11.

Neither starter got a decision. The Giants’ Robbie Ray allowed four runs (three earned) and eight hits in five innings with one walk and seven strikeouts. Boston’s Lucas Giolito had a 5-4 lead when he left after six innings, having allowed four runs (two earned) on four hits with two walks and five strikeouts.