The Diamondbacks have released reliever Joe Mantiply after he struggled throughout the 2025 season. Having previously been a reliable option in the bullpen, Mantiply faced a dramatic downturn in performance this year, posting a 15.83 ERA in 9 2/3 MLB innings and a 5.56 ERA in Triple-A. His fastball velocity has dipped significantly, which has affected his effectiveness on the mound. Although he has a solid track record, the challenges faced in 2025 prompted the Diamondbacks to seek other options. Nonetheless, Mantiply's experience may lead to another opportunity with a new team soon.
Mantiply's performance fell sharply in 2025, leading to his release by the Diamondbacks after struggling in both the majors and Triple-A.
Despite a solid track record and being healthy, Mantiply's diminished fastball velocity in 2025 contributed to a disastrous season.
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