Janson Junk joins Jacksonville as seventh Marlins rehab assignment this season

Janson Junk landed in Jacksonville on June 28, and the assignment matters far beyond one rehab note. Miami needs innings, and the Jumbo Shrimp are now the clearest checkpoint for whether Junk can get back into the Marlins’ pitching timeline without a detour.

The move made Junk the seventh Marlin to work a rehab assignment with Jacksonville this season, after Kyle Stowers, Maximo Acosta, Esteury Ruiz, Christopher Morel, Griffin Conine and Eury Pérez all came through the same stop. Stowers was the first Miami player to begin a rehab assignment with the Shrimp in 2026, and Jacksonville’s role has only grown louder after 18 different Marlins completed rehab stints there in 2025. This is no longer a one-off flyer on a minor-league affiliate. It is a pipeline, and Miami keeps feeding it.

Junk’s own path explains why Jacksonville is the right test. The right-hander had been on the 15-day injured list since May 28 with right shin bone inflammation, and before the injury he had made 11 starts for Miami, going 3-5 with a 4.80 ERA in 60 innings. If he returns quickly, someone in Miami’s current rotation mix or innings-eating role is going to feel the squeeze. That is what a successful rehab assignment does: it shortens the leash on the arm holding the temporary job.

Jacksonville is also a familiar proving ground for Junk. He pitched in 10 games for the Shrimp in 2025, starting nine of them, and went 5-3 with a 2.68 ERA. His broader major-league line, 47 games and 34 starts with a 10-12 record, a 4.84 ERA, 210.0 innings and 154 strikeouts, suggests Miami already knows the ceiling and is now checking the health. The first outing in Jacksonville should tell reporters plenty: whether his velocity is back where it was, how often he leans on each pitch, how deep the workload goes, and whether his command looks sharp enough to stay on schedule.

That matters because Jacksonville has become part of the everyday Marlins calendar. The Shrimp opened their 2026 season March 27 at VyStar Ballpark against Rochester, and by late June they were again sorting through another Miami rehab arm. If Junk clears this stop cleanly, the next decision belongs to the Marlins, not the box score.