The Miami Marlins could really use another consistent starting pitcher, preferably one who throws from the left side. As has been obvious throughout the season, they’re also lacking a catcher who can help control the running game—opponents have been safe on 46 consecutive stolen base attempts entering Monday.
With the calendar flipping to September, the Marlins have the flexibility to call up prospects Robby Snelling and Joe Mack from Triple-A Jacksonville to address those respective areas without having to demote any members of their active roster. Both Snelling and Mack would remain rookie-eligible for 2026. However, you won’t be seeing either of them in The Show quite yet.
As first reported by Fish On First’s Kevin Barral, the Marlins’ initial pitching reinforcement will instead be journeyman reliever Michael Petersen. We’re still awaiting confirmation on the position player call-up, but it won’t be Mack.
Although Snelling (2.75 ERA and 3.01 FIP across a full season in the upper minors) is undoubtedly ready for a promotion, the Marlins are expecting both Ryan Weathers and Janson Junk back from the injured list sometime next week. In the meantime, they want to evaluate Adam Mazur‘s viability as a rotation candidate first. My counter to that is, there are enough innings available for all of them and Snelling.
Above all else, it seems that the Marlins have prioritized gaining an extra year of club control over Snelling through the 2032 season, which they can guarantee by delaying his debut until mid-April.
As for Mack, there is a more coherent argument that he could benefit from another month of minor league development. Through 85 games at Triple-A, he has posted a 94 wRC+ with only one home run off of left-handed pitching.
Down on the farm, Triple-A Jacksonville won, 6-5. In his Jumbo Shrimp debut, Kemp Alderman went 1-for-4 with a two-run home run. Double-A Pensacola lost, 7-2. It was a terrific series for Fenwick Trimble, who went 10-for-21 with two homers and six walks. High-A Beloit lost, 2-1. The Sky Carp still hold a 1.5-game lead in the race for the second-half Midwest League West division title. Low-A Jupiter lost, 6-5. Drew Faurot extended his hitting streak to seven games.
More Marlins news and content below:
🔷 As illustrated above, the Marlins have a season-high 13 players on their major league injured list, with Dane Myers (right oblique strain) and Ryan Gusto (right shoulder impingement) being the latest casualties. Myers previously landed on the IL with the same issue in May. It’s unclear whether either of them will return this season.
🔷 Sandy Alcantara wrapped up his best month of the 2025 season, while Jakob Marsee enjoyed arguably the best month that any Marlins rookie has ever had.
🔷 Right-hander Karson Milbrandt told Locked On Marlins (episode embedded below) that he will be pitching in the Arizona Fall League. Assuming that the Mesa Solar Sox use Milbrandt as a starter, the 21-year-old should be able to establish a new season-high in innings pitched—he’s currently at 79 ⅓—while challenging himself against older, tougher competition.
🔷 Eli Ben-Porat of Baseball America likens the arsenal of Marlins draft pick Peyton Fosher to that of San Diego Padres starter Nick Pivetta.
🔷 Lake Bachar reminisced with David Laurila of FanGraphs about his football career at the University of Wisconsin-Whitewater and how he modified his breaking balls this past offseason.
🔷 The Prediction Time leaderboard has been updated through the first 44 series. Become a SuperSub and we’ll keep track of your predictions all season long!
🔷 Elsewhere around baseball, the Boston Red Sox extended Aroldis Chapman through the 2026 season with a mutual option for 2027. Carlos Santana and Walker Buehler joined the Chicago Cubs and Philadelphia Phillies via waiver claim and free agent signing, respectively. They’ll be postseason-eligible for their new clubs. José Ureña signed with the Los Angeles Angels, which will be the fifth different MLB team he’s played for in 2025 alone.
🔷 Today’s MLB game: the Marlins are playing the earliest game on MLB’s Labor Day schedule on the road against the Washington Nationals. The Nats have lost eight straight games and are calling up left-hander Andrew Alvarez to make his major league debut. This season in Triple-A, Alvarez has posted a 4.10 ERA, 4.45 FIP and .242 BAA in 123 innings pitched. Miami’s innings will be divvied up by a handful of relievers. With the likely exception of Calvin Faucher, everybody in the bullpen should be available to contribute. First pitch at 1:05 p.m. ET.
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