NEW: Will undergo Tommy John surgery, ending his 2026 season and likely costing him most of 2027. The UCL sprain suffered last week was confirmed as a full-surgery case. The 22-year-old LHP was one of the more promising rookie arms in baseball before the injury.

NEW: 15-day IL with a left UCL sprain. Felt pain during a between-starts bullpen Tuesday after his May 8 MLB debut. MRI confirmed the sprain — often a precursor to Tommy John, though not always. Best-case is 8-12 weeks of rest and rehab; worst-case is TJ surgery and a 14-16 month recovery. Braxton Garrett recalled to take his rotation spot.

Pitcher List's top SP add. Snelling's MLB debut was bumpy (5 IP, multiple walks), but the AAA underlying numbers (1.86 ERA / 2.92 FIP / 40% K-rate in 29 IP) are too good to drop. Marlins' rotation has the open slot through May. Hold/add aggressively in any keeper format; speculative add in 12-team redraft.

Snelling makes his MLB debut tonight at home vs. Washington — the 22-year-old LHP has been the Marlins' best minor-league arm and earns the rotation spot with Chris Paddack DFA'd. Pitcher List has him as the priority SP add. The 10.2% Triple-A SwStr% is a flag, but the fastball/curve combo is legit. Add aggressively.

Snelling makes his MLB debut Friday in Washington and the scouting case is compelling. His 40% K-rate and 56.9% groundball rate at Triple-A is a rare combination — those numbers almost never coexist. The fastball sits 95-96 mph with elite ride, and he tunnels it off a 60-grade, spike-grip 11-to-5 curveball. His 17 combined Triple-A starts across 2025-26 show a 1.46 ERA, 0.96 WHIP, and 12.1 K/9. The red flag is a 10.2% swinging-strike rate that would be below average against major-league hitters — his overall K-rate relies on weak contact rather than pure swing-and-miss, which is less reliable against better competition. Add now in 14+ team leagues and all dynasty formats. The Marlins need him, which means he'll get a legitimate run regardless of early bumps.

Started vs Washington Nationals (0W-0L, -.-- ERA)