Kelvin Rosario
P ACL D-backs
Age 20
LHP
6'2" / 140 lbs
ROK
Overview
ROKPROSPECT
ETA2028MLB%0%
| Year | Age | Lvl / Team | G | GS | IP | ERA | FIP | K% | BB% | WAR | MLE rates |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024 | 17 | ROKDSL Arizona R… | 10 | 5 | 39 | 2.97 | 3.48 | 24.6% | 9.0% | — | K 16.7% · BB 11.2% · FIP 4.69 |
| 2025 | 18 | ROKARI | 14 | 1 | 26 | 4.10 | 5.61 | 20.8% | 17.6% | — | K 14.1% · BB 22.0% · FIP 7.54 |
| 2026 | 19 | MIX2 levels | 20 | 0 | 35 | 7.01 | 4.77 | 24.9% | 15.3% | — | K 17.6% · BB 15.7% · FIP 5.76 |
| 2027PROJ | 20 | MLBARI | 16 | 0 | 17 | 5.44 | 5.44 | 20.1% | 15.6% | -0.2 | |
| 2028PROJ49% MLB | 21 | MLBARI | 15 | 0 | 16 | 5.18 | 5.08 | 20.9% | 13.6% | -0.1 |
Next 2 projected WAR -0.3Projected rows: MLB playing time only, park and league context applied.
Contract
No contract data on file.
Career WAR0 WAR median (P10 0 / P90 0, comp-based) · star 0% · didn't stick 99%
CompsRoberto Medina (age 19) · Matt Minnick (age 23) · Daniel Gonzalez (age 20)
2027 FULL-SEASON PROJECTIONrates below = full-season projection
showingPROJ
wRC+ AGAINSTvL 120128vR 136
ERA5.44
FIP5.44
K%20.1%
BB%15.6%
K-BB%4.5%
Proj IP17
Value2027 · WAR
Runs saved vs league avg · 17 IP
Grades · Contract
Contract
No contract data on file. Pre-MLB players and minor-league free agents do not yet have salary projections — entries are added at first 40-man roster placement.
Career Stats + Projections
Real MLB stats plus park-adjusted projections — this season (so far / rest / full), then future seasons and career totals.
basis chips:
RAW = as recorded ·
CTX = with park/league context ·
A+C = actual + context combined ·
MLE = level/park-neutral
Methodology▸ how WAR & MLE are computed
Stats are park-neutral MLB equivalents. The "TEAM" column shows current org affiliation only — we do NOT project at that team's park.
Rates (K%, BB%, HR-BF) are park-stripped; MiLB stat lines are translated to their MLB-equivalent via per-level MLE factors.
WAR is computed from projected runs prevented vs a replacement pitcher (the marginal arm a team would call up if this pitcher were unavailable) — calibrated to industry-standard fWAR.
| Year | Age | Lvl | Team | G | GS | IP | BF | K | BB | HR | GS% | IP/G | K% | BB% | K-BB% | HR% | ERA | FIP | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ▸ Career — actual stats, one row per year (as recorded, no adjustments) | |||||||||||||||||||
| ▸ Career — adjusted (each season translated to a park/league-neutral MLB-equivalent line; levels combined per year) | |||||||||||||||||||
| ▸ Model inputs — neutral MLE (past 3 seasons + 2027 so far) | |||||||||||||||||||
| 2023 | 16 | ROK MLE | DSL Arizona Red | 12 | 8 | 32 | 138 | 33 | 17 | 1 | 67% | 2.7 | 16.3% | 15.4% | 0.9% | 1.2% | 5.01 | 4.34 | — |
| 2023 | 16 | ROK RAW | DSL Arizona Red | 12 | 8 | 32 | 138 | 33 | 17 | 1 | 67% | 2.7 | 23.9% | 12.3% | 11.6% | 0.7% | 5.01 | 3.04 | — |
| 2024 | 17 | ROK MLE | DSL Arizona Red | 10 | 5 | 39 | 167 | 41 | 15 | 4 | 50% | 3.9 | 16.7% | 11.2% | 5.5% | 2.9% | 2.97 | 4.69 | — |
| 2024 | 17 | ROK MLE | DSL Arizona Red | 10 | 5 | 39 | 167 | 41 | 15 | 4 | 50% | 3.9 | 16.7% | 11.2% | 5.5% | 2.9% | 2.97 | 4.69 | — |
| 2024 | 17 | ROK RAW | DSL Arizona Red | 10 | 5 | 39 | 167 | 41 | 15 | 4 | 50% | 3.9 | 24.6% | 9.0% | 15.6% | 2.4% | 2.97 | 3.48 | — |
| 2025 | 18 | ROK MLE | ACL D-backs | 14 | 1 | 26 | 125 | 26 | 22 | 4 | 7% | 1.9 | 14.1% | 22.0% | -7.9% | 5.2% | 4.10 | 7.54 | — |
| 2025 | 18 | ROK MLE | ACL D-backs | 14 | 1 | 26 | 125 | 26 | 22 | 4 | 7% | 1.9 | 14.1% | 22.0% | -7.9% | 5.2% | 4.10 | 7.54 | — |
| 2025 | 18 | ROK RAW | ACL D-backs | 14 | 1 | 26 | 125 | 26 | 22 | 4 | 7% | 1.9 | 20.8% | 17.6% | 3.2% | 3.2% | 4.10 | 5.61 | — |
| 2026 | 19 | MIX MLE | 2 levels | 20 | 0 | 35 | 177 | 44 | 27 | 5 | 0% | 1.7 | 17.6% | 15.7% | 1.9% | 3.9% | 7.01 | 5.76 | — |
| 2026 | 19 | MIX MLE | 2 levels | 20 | 0 | 35 | 177 | 44 | 27 | 5 | 0% | 1.7 | 17.6% | 15.7% | 1.9% | 3.9% | 7.01 | 5.76 | — |
| 2026 | 19 | MIX RAW | 2 levels | 20 | 0 | 35 | 177 | 44 | 27 | 5 | 0% | 1.7 | 24.9% | 15.3% | 9.6% | 2.8% | 7.01 | 4.77 | — |
| ▸ 2027 season — projected remainder (no 2027 stats recorded) | |||||||||||||||||||
| 2027 | 20 | MLB | ARI | 16 | 0 | 17 | 72 | 14 | 11 | 2 | 0% | 1.1 | 20.1% | 15.6% | 4.5% | 3.1% | 5.44 | 5.44 | -0.2 |
| ▸ Career projection (2028+) — MLB context, MLB playing time (IP × MLB%) | |||||||||||||||||||
| 2028 | 21 | MLB MLE | ARI | 31 | 0 | 33 | 138 | 29 | 19 | 4 | 0% | 1.1 | 20.9% | 13.6% | 7.4% | 3.0% | 5.18 | 5.08 | -0.2 |
| 2028 | 21 | MLB CTX | ARI | 15 | 0 | 16 | 68 | 14 | 9 | 2 | 0% | 1.1 | 20.9% | 13.6% | 7.4% | 3.0% | 5.18 | 5.08 | -0.1 |
| ▸ Career totals — MLB only (actual + projected) | |||||||||||||||||||
| Career | — | RAW | 15 | 0 | 16 | 68 | 14 | 9 | 2 | 0% | 1.1 | 20.9% | 13.6% | 7.4% | 3.0% | 5.18 | 4.70 | -0.0 | |
| / 200 IP | — | RAW | 190 | 0 | 200 | 844 | 174 | 112 | 25 | 0% | 1.1 | 20.9% | 13.6% | 7.4% | 3.0% | 5.18 | 4.70 | -0.4 | |
| Career | — | MLE | 56 | 14 | 133 | 607 | 99 | 95 | 20 | 25% | 2.4 | 16.3% | 15.7% | 0.6% | 3.3% | 4.75 | 5.51 | -0.2 | |
| / 200 IP | — | MLE | 84 | 21 | 200 | 915 | 149 | 144 | 30 | 25% | 2.4 | 16.3% | 15.7% | 0.6% | 3.3% | 4.75 | 5.51 | -1.2 | |