23. RJ Petit (115 points, 12 ballots)
RJ Petit is a tough guy to miss. Colorado’s pick in the 2025 Rule 5 draft from the Detroit Tigers organization is a 6’8”, 300-pound titan of a right-handed relief pitcher. Originally drafted by the Tigers in the 14th round of the 2021 draft out of Charleston Southern, the 26-year-old has mostly served as a reliever after dabbling with starting during his draft year. As one might surmise given his size, Petit can throw in the mid to high-90s with a downward plane. He pairs that velo with a hard, sweeping slider that tunnels well with the fastball and a developing change-up.
Mid-season 2025 Rank: N/A
High Ballot: 14
Mode Ballot: 23
Future Value: 35+, middle relief
Contract Status: 2025 Rule 5 Draft, Detroit Tigers, 40 Man Roster, three options remaining
MLB ETA: 2026
Petit entered 2025 back at Double-A Erie for the third season in a row (where he was of league-average age) despite posting decent results there in 2024 and being unprotected and unselected in that year’s Rule 5 draft. In 27 games with Erie, Petit posted a 2.28 ERA with a dominant 0.95 WHIP and a 9.6 K/9 rate against a 2.5 BB/9 rate in 43 1/3 innings.
Petit finally got the call up to Triple-A Toledo (which is in the much more pitcher-friendly International League) in mid-July. Petit appeared in 20 games at the level with a 2.74 ERA, 1.26 WHIP, an outstanding 12.9 K/9 rate, and a 3.9 BB/9 rate in 23 innings, including a save. Petit was strong against both righties (.629 OPS against) and lefties (.579 OPS) while allowing just four homers in 66 1/3 innings during 2025. Despite the success at the Triple-A level, Petit was again left unprotected in the Rule 5 draft and this time the Rockies took him with the first pick.
Here’s some video of Petit from his time in the 2023 Arizona Fall League:
Here was Eric Longenhagen’s scouting report on Petit after the Rule 5 draft:
Petit is a pretty standard mid-90s fastball (94-97 mph, touch 98) and a plus slider reliever. He utilizes his slider in all counts because his size creates hittable plane on his fastball, but the addition of a second fastball type (he throws both elevated four-seamers and in-zone two-seamers) helped limit opponents’ contact quality against his heaters in 2025, as both had a sub-.300 xwOBA against. Petit also creates enough sink on his changeup to keep lefties in check, so his role isn’t at risk of being minimized to that of a righty specialist if he throws enough strikes (no guarantees) to make the Rockies bullpen next spring.
Longenhagen ranked Petit as a 40 FV player last March, 25th in Detroit’s system.
Petit ranks 26th on MLB.com’s Rockies prospect list as a 40 FV pitcher with a 60 grade on the slider:
Standing at 6-foot-8, Petit is a tremendous presence on the mound. He doesn’t get big extension out of that frame, instead using his height to create a steep downward plane leading to solid groundball rates. There is some velocity here, touching 98 mph while sitting 94-96, and he’s worked to generate a bit more heat. Petit’s 83-85 mph gyro slider is much better at generating swing-and-miss and chase low in the zone with strong depth, and the Rockies think it’s the kind of breaking ball that should play in Coors Field. He can tunnel his 86-89 mph changeup well enough off the fastball with just enough velocity separation for it to be effective.
Petit has shown the ability to get righties and lefties out at the upper levels, and he was able to get his walk rate back down in 2025 to 3.0 per nine after seeing it creep up in 2024 (4.1 BB/9). He’ll get his chance to stick with the Rockies, who see him as a potential bulk reliever.
Petit is almost certain to be a one and done PuRP, as he will either stick on Colorado’s roster long enough in 2026 to exhaust his rookie eligibility or he won’t and will be returned to the Tigers. He represents a good multi-inning mop-up relief a la Anthony Molina in his Rule 5 year in 2024, with the size and breaking ball to be better than that. I ranked him 23rd on my ballot at the bottom of my 40 FV tier due to the floor.
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