Justin Martinez has swiftly become one of the Arizona Diamondbacks’ most watched players. Known for his blazing fastball and dynamic presence on the mound, Martinez’s recent performances have sparked conversation not just among fans, but also coaches and analysts. This article explores the current state of his career, velocity concerns, and how Martinez and the Diamondbacks are addressing new challenges.

Justin Martinez’s Electric Start

Since joining the Diamondbacks, Justin Martinez has built a reputation for his incredible arm strength. His 101 MPH sinker and four-seamer, complemented by an impressive splitter and a wipeout slider, have made him a formidable closer according to Sports Illustrated. Martinez’s abilities were rewarded with a five-year, $18 million contract extension, a testament to the organization’s confidence in his talent.

Recent Performance and Velocity Concerns

However, the 2025 season has presented some notable hurdles. During a recent series against the Atlanta Braves, Martinez closed out a game but observers noted a significant drop in his average fastball velocity. His four-seamers hovered around 97.2 MPH, nearly four MPH lower than his earlier season average. While minor variations are common, a sharp dip like this understandably raised concerns about Martinez’s health and long-term prospects.

Team officials and Manager Torey Lovullo have been transparent. Lovullo acknowledged the issue, stating, “I’m not going to lie and say that while I was watching it, there wasn’t a little bit of concern. I saw the same numbers you did. Of course I am concerned.” Despite these worries, medical evaluations indicate that Martinez remains healthy. The explanation points towards shoulder fatigue or possible "dead arm," a condition not uncommon among pitchers but one that requires careful management. Read the full story here.

Injury Management and Martinez’s Response

Justin Martinez himself has addressed the situation, sharing that he experienced stiffness but felt ready to compete. Determined to work through fatigue, Martinez continues to prepare meticulously. He draws on guidance from veteran teammates and coaches, including visualization techniques and warm-up routines adapted to each ballpark. MLB’s coverage discusses his preparation and mindset.

Physical health is only one part of Martinez’s journey. His ability to speak with reporters directly—without a translator this year—shows his growing confidence and leadership in the clubhouse. These signs suggest Martinez is committed to adapting and overcoming adversity, much to the relief of the Diamondbacks' staff and fanbase.

What This Means for the Diamondbacks

The bullpen has faced its share of turbulence this season. Injuries to other key relievers, like A.J. Puk, have placed added responsibility on Justin Martinez’s shoulders. The team’s success through a tough stretch rests in part on his continued health and performance. With a stretch of 16 games in 16 days ahead, the Diamondbacks cannot afford to lose their electric closer for any length of time. For extended coverage and in-depth analysis of Martinez and the team's outlook, see MLB.com’s detailed report.

Conclusion: Martinez’s Path Forward

Justin Martinez’s journey underscores the highs and lows experienced by top-level closers. As the Diamondbacks strive to stay competitive, Martinez’s resilience, adaptability, and talent remain critical. Continued vigilance by the medical staff and open communication with coaches will help ensure he maintains his place among MLB’s most exciting young relievers.

Stay tuned for further updates on Justin Martinez as he works to regain his peak velocity and helps lead the Diamondbacks through a demanding MLB season.