2025 Roster Dark Horse: Seth Martinez

Photo by Logan Riely/MLB Photos via Getty Images If Arizona is quietly cornering the market in Corbins, they also appear to be making a push for the more specialist category, of relievers called Martinez. We all know about Justin, the flame-throwing bullpen arm, who might end up closing games for the Diamondbacks at some point this year. But in November, the team added Seth, selecting him off waivers from the Houston Astros. The right-handed pitcher had originally been a 17th-round pick by the Oakland Athletics in 2016, but moved to the Astros in the minor-league portion of the 2020 Rule 5 draft. He made his major-league debut for Houston the following year, and since has posted a 3.93 ERA (103 ERA+) over 137.1 innings, with a K:BB of 122:54.

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