Former All-Star right-hander Walker Buehler, one of Boston's big free-agent offseason signings, was released by the Red Sox on Friday.

In a corresponding move, the Red Sox selected the contract of left-hander Payton Tolle, 22, from Triple-A Worcester. Tolle, Boston's No. 2 prospect as rated by MLB Pipeline, is scheduled to make his major league debut on Friday night at home against the Pittsburgh Pirates.

Buehler was moved from the starting rotation to the bullpen a week ago. After a 4-1 start to the season followed by about a month on the injured list (shoulder inflammation), Buehler hasn't been nearly as effective. He is 7-7 on the season with a 5.45 ERA, 84 strikeouts and a career-high 55 walks in 112 1/3 innings over 23 games (22 starts).

An All-Star in 2019 and 2021 with the Los An

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