Marlins Claim Seth Martinez

The Marlins have claimed right-hander Seth Martinez off the Seattle waiver wire, as announced by the Mariners.  It wasn’t known that Martinez had been designated for assignment, and Martinez only joined the Mariners on another waiver claim from Miami less than two weeks ago. The Marlins went on to announce that left-hander Andrew Nardi was placed on the 60-day injured list with low back inflammation to make room for Martinez’s return to the 40-man roster.

Martinez, 30, was drafted by the Athletics in the 17th round of the 2016 draft but has spent his entire MLB career in an Astros uniform. The right-hander made his big league debut in 2021 for an ill-fated cup of coffee where he surrendered five runs across three innings of work, but provided solid middle relief work for the Astros since then. Martinez’s 2022 season was particularly impressive, as he dominated to the tune of a 2.09 ERA across 38 2/3 innings of work with a 24.5% strikeout rate against a 9.0% walk rate. That production wasn’t entirely supported by more advanced metrics, but his 3.32 FIP and 3.56 SIERA still suggested even his underlying performance was that of a quality relief arm.

Unfortunately, Martinez has not been able to maintain that level of success in the years since. The right-hander’s 2023 campaign was something of a disaster, as he struggled to a 5.23 ERA with a 4.42 FIP in 43 innings of work. While his ERA was inflated by a below-average strand rate and a more than 100-point jump in BABIP, his walk and home run rates both crept upwards as well to make the struggles more than simple bad luck. While the luck-based factors in Martinez’s 2023 season reversed in 2024, allowing him to post a solid 3.59 ERA in 52 2/3 frames for Houston last year, his skills took a major step backward as his strikeout rate plummeted to just 16.2% while he surrendered the most home runs of his career.

Those struggles led the Astros to designate Martinez for assignment back in November, and he’s been riding the waiver wire ever since. The right-hander was first claimed by the Diamondbacks and spent most of the offseason with Arizona, but was DFA’d once again to make room for veteran hurler Kendall Graveman on the Snakes’ 40-man. He was picked up by Miami shortly thereafter and since then has been shipped to Seattle, and now will land back in Miami as a potential bullpen arm for a Marlins club with plenty of interesting rotation arms but very little certainty in their relief corps.

Things are even more unsettled in the Miami bullpen due to Nardi’s placement on the shelf. The southpaw entered camp behind schedule but the club provided little information about his situation, instead only noting that he had “some stuff flare up in the offseason.” Evidently, Nardi’s back issues are serious enough that the club does not anticipate him being ready to pitch before the end of May, an unfortunate development regarding one of the club’s better relief arms. The lefty posted an ugly 5.07 ERA in 2024, but underlying metrics suggested his performance was much stronger than that. He struck out a whopping 33.3% of opponents faced, walked just 8.6%, and kept hard contact to a minimum en route to a 2.76 xERA, a 2.77 SIERA, and a 3.33 FIP.

All of those figures were much more in line with the production Nardi posted in 2023, when he pitched to a 2.67 ERA in 57 1/3 innings of work. Given his excellent peripherals last year and previous success, Nardi seemed to be a likely candidate for a late-inning role with the Marlins this year. This injury will put that on hold for at least the season’s first couple of months, and perhaps longer depending on Nardi’s timetable for a return to action.