Marlins Claim Tyler Zuber, Designate Nick Nastrini

1:47pm: The Marlins announced that Zuber has indeed been claimed off waivers from the Mets. Miami designated right-hander Nick Nastrini for assignment to open a spot on the 40-man roster.

The 25-year-old Nastrini was claimed off waivers from the White Sox eight days ago. He’s started one game in Jacksonville since that claim, pitching two innings and allowing a a pair of runs in a concerning manner; Nastrini didn’t allow a hit in that appearance but issued four walks and plunked three batters.

Once a well-regarded prospect in the Dodgers and White Sox systems, Nastrini pitched poorly in 35 2/3 big league innings during last year’s debut with the White Sox. He also struggled to a 5.29 ERA in 85 Triple-A frames and has been knocked around for a 7.58 earned run average in 46 1/3 Triple-A innings so far in 2025. Nastrini has long drawn praise for a pair of quality breaking balls that give him strong bat-missing abilities, but command has been persistently cited as a weakness in scouting reports — and that’s played out so far both in Triple-A and in the majors.

The Marlins will have five days to place Nastrini back on waivers or trade him to another club. He’s in his second of three minor league option years.

1:35pm: The Marlins claimed right-handed reliever Tyler Zuber off waivers from the Mets, reports Kevin Barral of Fish On First. He’s been optioned to Triple-A Jacksonville. The Mets designated Zuber for assignment over the weekend. Miami has yet to formally announce the waiver claim, which will require the team to open a spot on the 40-man roster.

Zuber, 30, pitched in only one game with the Mets, allowing a pair of runs in two innings. He’s appeared in parts of four big league seasons between New York, Kansas City and Tampa Bay, working to a combined 5.27 ERA with a 25.2% strikeout rate and a 15.9% walk rate.

Zuber has also pitched in parts of four Triple-A seasons but carries an ERA north of 5.00 there as well. Command issues have dogged him, particularly in the upper minors, but he’s regularly shown an ability to miss bats — both in terms of his raw strikeout rate and his typically above-average swinging-strike rates. He’s in his final minor league option year, so the Marlins can shuttle him back and forth between Jacksonville and Miami without needing to expose Zuber to waivers.

While he’s typically been a three-pitch reliever in the past, Zuber has added a changeup to his repertoire in Triple-A this year and tossed the pitch at an 11% clip. He’s still leaning primarily on a four-seamer that’s averaging 93.8 mph, a slider in the 82-83 mph range and a cutter in the low 90s, but the addition of a changeup gives him another offering with which to experiment while he tries to work his way back to the big league level with his new club.