Arizona Diamondbacks RHP Shelby Miller has emerged as a surprising closer in the wake of injuries to Justin Martinez and A.J. Puk. After a shaky ninth inning outing for Martinez, Miller stepped up and earned his fourth career save, showcasing a strong fastball velocity that has helped him maintain a solid strikeout rate of 29.8%. Despite concerns about his history of inconsistency, he may be the best bet for saves in Arizona's bullpen.

Emilio Pagan of the Cincinnati Reds is solidifying his role as the primary closer, particularly with Alexis Diaz struggling with command and now in Triple-A. Pagan's performance has improved his visibility in fantasy leagues for those in search of saves, despite being prone to giving up home runs. Additionally, Luke Weaver has emerged as a potential saves option with Devin Williams underperforming recently.

The Miami Marlins have made a key move ahead of the 2024 trade deadline, sending A.J. Puk to the Arizona Diamondbacks in exchange for infield prospect Deyvison de los Santos. Puk, who was once a top prospect with the Oakland Athletics, has transitioned to a reliable middle reliever since his debut in 2019. He has excelled this season with a 1.32 ERA and two saves for the Diamondbacks, though he is currently sidelined due to a flexor strain in his elbow. Despite the injury, the team remains optimistic about his recovery, believing he won't need surgery. In the meantime, Justin Martinez is expected to step into the closer role while Puk is out. Martinez boasts an impressive 0.90 ERA this season, demonstrating his potential as a strong replacement.

Injuries are becoming a factor early in the 2025 MLB season, affecting key players and fantasy lineups. A.J. Puk of the Arizona Diamondbacks has been placed on the 15-day injured list due to left elbow inflammation after a solid start with four saves. Luis Arraez of the San Diego Padres suffered a concussion that will sideline him for at least a week. Meanwhile, George Kirby of the Seattle Mariners is recovering from shoulder inflammation, with a potential return in May after positive reports following his bullpen sessions. Fantasy managers will need to keep an eye on these developments as they navigate the waiver wire.

A.J. Puk, the Arizona Diamondbacks' top reliever, has been placed on the 15-day injured list due to left elbow inflammation, raising concerns so early in the season. He reported discomfort following his last appearance where he secured a save against Miami. Management decided to take precautionary measures with Puk's injury, especially given his critical role in the bullpen. General Manager Mike Hazen confirmed that the decision was made after Puk's elbow stiffness progressed after the game. The team is awaiting MRI results to assess the severity of the condition.

Puk, who has a 3.38 ERA with 12 strikeouts in eight innings this season, was expected to have a prominent role in the bullpen after an impressive second half to last season. His absence will be felt, particularly since he was sharing closing duties with Justin Martinez. In light of this situation, Drey Jameson has been brought in to replace him on the roster, marking his return from Tommy John surgery.