The Marlins will promote top catching prospect Joe Mack prior to tomorrow’s game with the Phillies, SportsGrid’s Craig Mish reports. Agustin Ramirez will be optioned to Triple-A in the corresponding 26-man roster move, and Mack is already on Miami’s 40-man roster.
Mack was the 31st overall pick of the 2021 draft, and after steadily working his way up the Marlins’ minor league ladder, the 23-year-old is now on the cusp of his Major League debut. Baseball America ranks Mack as the 50th-best prospect in the sport, and pundits like The Athletic’s Keith Law (52nd), MLB Pipeline (54th) and ESPN.com (61st) also have Mack listed within their top-100 rankings.
The consensus is that Mack is ready for the big leagues on defense alone, as he has received praise for his framing, blocking, and strong throwing arm. There have been fewer questions about his ability to hit since Mack bounced back from a poor 2023 season to post much better numbers across the last three minor league campaigns, and he has hit .249/.334/.444 with 21 home runs over 515 plate appearances with Triple-A Jacksonville.
Mack’s approach is a little all-or-nothing since he is primarily looking to pull the ball in the air, but even if this leads to his share of strikeouts, Mack has enough power to capitalize when he does make contact. Over 103 PA in Jacksonville this season, Mack’s walk rate has shot up to 19.4% (from 8.5% in 412 Triple-A PA in 2025) and he has reduced his strikeout rate from 27.9% to 21.4%.
More to come…