Zack Kelly was optioned to Worcester following a loss to the New York Yankees as part of a roster shake-up that included the recall of Bailey Horn and the selection of Zach Penrod's contract.

Zack Kelly struggled in the seventh inning, walking the bottom two batters in New York's lineup before giving up an RBI single to Gleyber Torres, leading to his removal. His performance contributed to a critical moment in the game, allowing the Yankees to mount a comeback against the Red Sox.

Zack Kelly struggled as a reliever for Boston, particularly in the ninth inning, where he gave up multiple hits that contributed to Chicago's five-run rally, ultimately sealing the Red Sox's loss. This outing added to the team's recent difficulties, marking their tenth loss in sixteen games.

Zack Kelly gave up the game-tying 450-foot, two-run homer in the 10th inning for the Red Sox against the Rockies.

Zack Kelly is expected to handle late-inning duties for the Boston Red Sox in the absence of injured relievers Chris Martin and Justin Slaten.