D-backs Develop Future Fireballers for Bullpen

The Arizona Diamondbacks' bullpen is facing challenges as key relievers A.J. Puk and Justin Martínez have landed on the injured list, prompting the team to seek reliable options for high-leverage situations. Shelby Miller has emerged as a standout candidate for the closer role, showing significant improvement in his performance since transitioning to a full-time reliever, including modifying his splitter to increase its effectiveness and swinging strike rate. Miller's strong start to the season, where he has yet to allow an earned run, underscores his value to the bullpen, though his effectiveness in various roles could influence the team's decision on how to deploy him. The Diamondbacks may also need to explore internal and external options to bolster their bullpen as the season progresses.