Marlins Catching Carousel: Joe Mack Up, Agustín Ramírez Down — What It Means for Miami's Lineup

As FanGraphs reported, the Marlins made a quiet but telling roster move Monday, optioning Agustín Ramírez to Triple-A Jacksonville and promoting top catching prospect Joe Mack to the active roster. The move came despite Miami's catchers ranking fifth in WAR and third in collective wRC+ (133) across baseball this season — a position group that has been one of the few genuine bright spots on a team still navigating a long rebuild. The driver behind the swap wasn't organizational dissatisfaction with the catching corps overall. It was Liam Hicks.

Hicks, far less celebrated than Ramírez entering the year, has played his way into everyday relevance, giving Miami the cover to address what was becoming an untenable defensive liability. Ramírez — the centerpiece return in the 2024 Jazz Chisholm Jr. trade — posted a .231/.287/.413 slash line and exactly 0.0 WAR in 136 rookie games last year, with Statcast ranking him second-worst among qualified catchers in Fielding Run Value. His blocking and throwing grades were the worst in baseball. Through the first month of 2026, the bat hasn't meaningfully progressed (86 wRC+, down from 91 last year), his barrel rate has cratered six points, and the glove hasn't caught up. Manager Clayton McCullough was direct about the rationale, stating Monday that 'it got to the point where it is performance and felt like, especially on the defensive side of things, that while he put in a lot of good work this offseason and had seen some glimpse of things getting better, that part of his game needs to continue to improve to be able to catch up here for us.'

The Ramírez demotion is as much a referendum on catcher defense as it is on his bat. Passed balls, wild pitches, and poor framing all bleed into run prevention — and run prevention directly shapes team totals. With Mack now handling some of the catching load alongside Hicks, the Marlins are upgrading the defensive profile behind the plate. Mack is regarded as a plus defender, particularly in terms of receiving and game-calling, which matters enormously for a Miami rotation leaning on young arms trying to limit walks and generate soft contact.

For bettors, the relevant question is what a tighter defensive catching unit does to Miami's team total profile. The Marlins have been playing in low-scoring games that frequently undercut market totals — and a credible defensive upgrade at catcher reinforces the under lean on Miami's side of the ledger. Opponent team totals against Marlins starters are worth monitoring too: if Mack and Hicks together suppress run scoring more effectively than the Ramírez-anchored lineup did, books pricing Miami's pitching staff at its surface ERA may be slow to adjust. On the flip side, Ramírez's absence removes one of Miami's higher-upside bats from a lineup that can barely afford the subtraction — his power ceiling, however inconsistent, was real.

The bigger long-term bet here is on Mack's upside. If he shows even league-average offensive production while delivering the defensive value scouts project, he becomes a stabilizing force for a rotation that ranks near the bottom of the league in run support. Watch for early-count strikeout and walk trends from Marlins starters in Mack's first few starts — a competent pitch-framer can quietly shade first-5-innings totals in Miami's favor against mid-tier offenses.