Justin Martinez is part of a Diamondbacks bullpen that struggled in 2024, ranking No. 26 in MLB with a 4.41 ERA. However, Martinez, along with A.J. Puk, Kevin Ginkel, Ryan Thompson, Joe Mantiply, and Bryce Jarvis, had individual ERAs under 4.00, indicating potential for improvement in the upcoming season.

Justin Martinez had a successful season with a 2.48 ERA and 91 strikeouts in 72.2 innings, but he struggled down the stretch, allowing 12 runs (nine earned) in his last 19 appearances. The Diamondbacks' bullpen was a significant factor in their playoff miss, accounting for 30 losses. Strengthening the bullpen is a top priority for the team, and acquiring Devin Williams could significantly enhance their chances for contention in 2025.

Justin Martinez emerged as a key contributor in the Diamondbacks' bullpen following Paul Sewald's struggles. With Sewald's declining performance and eventual removal from the closer role, Martinez stepped up to help stabilize the late-inning situation. His presence, along with other young arms like A.J. Puk and Ryan Thompson, signaled a shift towards a more youthful and dynamic bullpen for Arizona, as they looked to move on from the veteran leadership Sewald provided in the previous season.

Justin Martinez had a breakout season as a closer, posting a stellar 2.48 ERA with 91 strikeouts over 72 2/3 innings while converting eight saves. Despite struggling in September, he emerged as a reliable option in the bullpen, showcasing his potential for a more prominent role in the future.

Justin Martínez has emerged as a significant contributor for the Diamondbacks, boasting an impressive 172 ERA+ and averaging over 11 strikeouts per nine innings in his rookie season. His exceptional velocity is a standout feature, with his sinker averaging 98.8 mph and peaking at 103 mph. This combination of speed and effectiveness positions him as a potential breakout star in the postseason.