Justin Martinez signed a five-year, $18 million extension with the Diamondbacks on Friday, per team updates, locking in through 2029 with options for 2030-31.

Fantasy Impact

Martinez’s 2.48 ERA and 91 strikeouts in 72.2 innings last year anchor his new $18M deal Friday, covering 2025-29, though his ninth-inning role vies with A.J. Puk and Kevin Ginkel for Arizona. The 23-year-old secures stability. Fantasy managers in all leagues should roster him, banking on his heat for saves or high-leverage value in the Diamondbacks’ 2025 bullpen.

Diamondbacks manager Torey Lovullo said he probably won’t name a closer before the season starts.

Fantasy Impact

Justin Martinez seems to be the favorite as of now after a strong spring. A.J. Puk and Kevin Ginkel could also be in the mix. It is possible this ends up being a committee in the Diamondbacks bullpen.

Justin Martinez notched a save, striking out one in a clean inning as the Diamondbacks topped the Mets 8-5 on Wednesday.

Fantasy Impact

Martinez's outing was a model of efficiency, requiring just nine pitches to secure his seventh save of the season. This performance underscores his growing reliability in the closer role, especially considering his solid 1.98 ERA and impressive 11.1 K/9 rate. His WHIP stands at 1.22, which, while not elite, is manageable given his high strikeout capabilities and consistent save conversions. Fantasy managers should feel increasingly confident in deploying Martinez as a regular closer, as his ability to shut down opponents in tight situations boosts his value in all formats.

Justin Martinez allowed one run on one hit over one inning on Sunday against the Red Sox.

Fantasy Impact

Martinez allowed a solo home run, but still held on for his sixth save on the season. He has taken hold of the closer role in the Diamondbacks bullpen.

Justin Martinez managed to secure a save despite allowing a run in the Diamondbacks' 10-8 victory over the Marlins.

Fantasy Impact

He threw 31 pitches, yielding two hits and a walk while striking out four over 1.2 innings. This performance, while effective in preserving the win, showcased some cracks in his otherwise stellar season, marked by a 1.89 ERA and 1.25 WHIP. His ability to strike out four batters continues to highlight his strong 11.21 K/9 rate, but the hits and walk allowed could be a slight concern for fantasy managers relying on him for pristine late-game performances. Martinez's role as a closer appears secure for now, but any increase in WHIP or ERA moving forward could prompt fantasy managers to monitor his outings more closely.