William Kempner
P
Jacksonville Jumbo Shrimp
+0.1
WAR
INJURED · Reassigned to Minors (RM)
Age 25
RHP
6'0" / 222 lbs
AAA
peak 0.5 · 2027
ERA4.38
FIP4.38
xFIP—
SIERA—
K%25.2%
BB%12.9%
K-BB%12.3%
IP67
trajectory · 10 yrs
0.5peak
2027
OFP—40
STUF—35
CTRL—35
K†5555
Career (MLE) + Projections
Park-neutral MLB-equivalent. MiLB translated via MLE factors. FIP-based WAR vs replacement FIP=5.3 (SP) / 4.95 (RP, <80 IP). FIP+ = runs above league-avg FIP · REP = replacement-level bonus.
| Year | Age | Lvl | Team | G | GS | IP | BF | K | BB | HR | K% | BB% | HR% | ERA | FIP | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022 | 21 | A | San Jose Giants | 5 | 2 | 9 | 43 | 11 | 6 | 1 | — | — | — | 5.00 | — | — |
| 2023 | 22 | AA | Richmond Flying Squirrels | 38 | 5 | 63 | 278 | 78 | 30 | 5 | 21.5% | 12.2% | 2.2% | 3.73 | 4.04 | +0.7 |
| 2025 | 24 | AAA | Jacksonville Jumbo Shrimp | 48 | 0 | 68 | 283 | 95 | 40 | 2 | 27.3% | 15.5% | 0.9% | 2.26 | 3.24 | +1.4 |
| ▸ 2026 Season | ||||||||||||||||
| 2026 | 25 | AAA | Jacksonville Jumbo Shrimp | 7 | 0 | 8 | 36 | 21 | 7 | 1 | — | — | — | 4.50 | — | — |
| ROS | 25 | MLB | MIA | 27 | — | 27 | 113 | 26 | 15 | 3 | 23.4% | 13.6% | 2.6% | 4.63 | 4.63 | +0.1 |
| 2026 Total | 25 | MLB | MIA | — | — | 35 | 149 | 47 | 22 | 4 | 31.9% | 15.0% | 2.6% | 4.60 | 3.56 | +0.5 |
| ▸ 2027+ Projections — Marcel base + age-bracket aging | ||||||||||||||||
| 2027 | 26 | MLB | MIA | 12 | 12 | 67 | 282 | 66 | 37 | 7 | 23.6% | 13.1% | 2.6% | 4.58 | 4.57 | +0.3 |
| 2028 | 27 | MLB | MIA | 12 | 12 | 66 | 280 | 66 | 36 | 7 | 23.6% | 12.8% | 2.6% | 4.57 | 4.56 | +0.3 |
| 2029 | 28 | MLB | MIA | 12 | 12 | 65 | 275 | 65 | 35 | 7 | 23.5% | 12.7% | 2.7% | 4.57 | 4.58 | +0.3 |
| 2030 | 29 | MLB | MIA | 12 | 12 | 64 | 269 | 63 | 34 | 7 | 23.4% | 12.7% | 2.7% | 4.60 | 4.62 | +0.3 |
| 2031 | 30 | MLB | MIA | 11 | 11 | 62 | 261 | 61 | 33 | 7 | 23.2% | 12.8% | 2.8% | 4.65 | 4.68 | +0.2 |
| 2032 | 31 | MLB | MIA | 60 | — | 60 | 252 | 58 | 33 | 7 | 23.0% | 12.9% | 2.9% | 4.71 | 4.76 | +0.1 |
| 2033 | 32 | MLB | MIA | 57 | — | 57 | 242 | 55 | 32 | 7 | 22.7% | 13.1% | 3.0% | 4.79 | 4.84 | +0.1 |
| 2034 | 33 | MLB | MIA | 55 | — | 55 | 231 | 52 | 31 | 7 | 22.4% | 13.3% | 3.0% | 4.88 | 4.94 | +0.0 |
| 2035 | 34 | MLB | MIA | 52 | — | 52 | 219 | 48 | 29 | 7 | 22.1% | 13.5% | 3.1% | 4.98 | 5.05 | -0.1 |
| 2036 | 35 | MLB | MIA | 49 | — | 49 | 206 | 45 | 28 | 7 | 21.7% | 13.7% | 3.3% | 5.09 | 5.17 | -0.1 |
| 2037 | 36 | MLB | MIA | 46 | — | 46 | 193 | 41 | 27 | 7 | 21.2% | 13.9% | 3.4% | 5.22 | 5.30 | -0.2 |
| ▸ Career (all levels · actual + projected) | ||||||||||||||||
| Career | — | 98 | 7 | 147 | 640 | 169 | 91 | 11 | 26.4% | 14.2% | 1.7% | 3.18 | 3.58 | +2.9 | ||
| / 200 IP | — | 133 | 10 | 200 | 869 | 229 | 124 | 15 | 26.4% | 14.2% | 1.7% | 3.18 | 3.58 | +3.9 | ||
Career Path Comps
What happened to similar pitchers from this age · Y-axis: ERA+ (100 = league avg, 150 = elite, 80 = below) · Bands: P10–P90 outer, P25–P75 inner · Gold: OGILVIE projection
| Profile at Match Age | Next 3 Yrs | Career | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comp | Age | Role | FIP | K% | BB% | HR/BF | BABIP | FIP | K% | K-BB% | IP | ΔFIP | Low FIP | IP | Match |
| William Kempner (OGILVIE) | — | — | 4.63 | 23.4% | 13.6% | 2.6% | — | 4.57 | 23.6% | 10.7% | 198 | -0.06 | — | — | — |
| Brandon Cunniff R 2027 · 4.25 FIP | 26 | SU | 4.25 | 24.5% | 13.2% | 2.8% | .256 | 4.33 | 20.3% | 9.0% | 115 | +0.08 | 3.88 | 180 | 91 |
| Dylan Hall R 2026 · 3.98 FIP | 25 | SU | 3.98 | 21.0% | 13.2% | 1.8% | .305 | 7.30 | 15.1% | 2.4% | 58 | +3.32 | 3.48 | 153 | 88 |
| Cameron Gann R 2025 · 4.21 FIP | 24 | SU | 4.21 | 21.4% | 12.4% | 2.4% | .296 | 5.37 | 21.1% | 6.8% | 23 | +1.16 | 3.60 | 146 | 86 |
| Tyler Mitzel R 2026 · 4.01 FIP | 25 | SU | 4.01 | 20.8% | 12.0% | 2.1% | .323 | 4.17 | 23.4% | 17.9% | 58 | +0.16 | 4.01 | 142 | 85 |
| Chris Jefferson R 2026 · 3.49 FIP | 25 | SU | 3.49 | 22.4% | 10.2% | 1.8% | .330 | 4.95 | 16.5% | 3.9% | 101 | +1.46 | 3.49 | 140 | 85 |
| Trey Benton R 2026 · 4.53 FIP | 25 | SU | 4.53 | 23.8% | 13.9% | 3.0% | .366 | 2.92 | 18.1% | 7.4% | 31 | -1.61 | 2.92 | 139 | 85 |
| Nathanael Santiago R 2026 · 3.43 FIP | 25 | SU | 3.43 | 20.3% | 11.4% | 1.1% | .286 | 3.56 | 23.2% | 10.9% | 71 | +0.13 | 2.48 | 138 | 85 |
| Jason Stoffel R 2027 · 3.60 FIP | 26 | SU | 3.60 | 23.4% | 10.1% | 2.2% | .267 | 3.51 | 27.2% | 19.2% | 59 | -0.09 | 3.51 | 103 | 84 |
| Logan Boyer R 2027 · 3.70 FIP | 26 | SU | 3.70 | 25.0% | 12.3% | 2.1% | .267 | 4.91 | 17.9% | 1.6% | 54 | +1.21 | 3.70 | 121 | 84 |
| Jake Lee R 2025 · 4.64 FIP | 24 | SU | 4.64 | 25.7% | 12.4% | 3.9% | .296 | 3.50 | 18.7% | 10.3% | 40 | -1.14 | 2.78 | 181 | 84 |
| Kyle Hill R 2026 · 3.84 FIP | 25 | SU | 3.84 | 22.7% | 14.9% | 1.4% | .282 | 4.63 | 23.5% | 10.8% | 73 | +0.79 | 3.62 | 156 | 84 |
| Dakota Mekkes R 2025 · 4.57 FIP | 24 | SU | 4.57 | 23.1% | 15.4% | 2.7% | .290 | 4.86 | 16.7% | 1.8% | 70 | +0.29 | 2.95 | 246 | 84 |
| Mason Vinyard R 2026 · 3.60 FIP | 25 | SU | 3.60 | 23.4% | 14.3% | 1.2% | .292 | 4.41 | 21.8% | 7.3% | 47 | +0.81 | 3.60 | 154 | 84 |
| Jesus Pirela R 2027 · 3.85 FIP | 26 | SW | 3.85 | 23.7% | 11.6% | 2.3% | .305 | 3.92 | 17.1% | 13.9% | 45 | +0.07 | 3.23 | 161 | 83 |
| Brooks Kriske R 2026 · 3.48 FIP | 25 | SU | 3.48 | 26.1% | 12.2% | 1.9% | .245 | 4.81 | 28.6% | 16.5% | 41 | +1.33 | 3.04 | 230 | 83 |
| Layne Henderson R 2026 · 4.47 FIP | 25 | SU | 4.47 | 22.9% | 14.8% | 2.6% | .289 | 4.35 | 24.4% | 10.0% | 126 | -0.12 | 3.91 | 233 | 83 |
| Cayne Ueckert R 2026 · 4.44 FIP | 25 | SU | 4.44 | 24.6% | 12.9% | 3.2% | .150 | 5.55 | 21.4% | 5.1% | 124 | +1.11 | 3.94 | 205 | 83 |
| Luis Ramirez R 2025 · 3.73 FIP | 24 | SW | 3.73 | 24.0% | 12.6% | 1.9% | .286 | — | — | — | — | — | 3.73 | 104 | 82 |
| Tommy Kahnle R 2026 · 4.17 FIP | 25 | SW | 4.17 | 23.8% | 14.8% | 2.2% | .284 | 2.58 | 30.9% | 21.0% | 165 | -1.59 | 1.53 | 433 | 82 |
| Dakota Donovan R 2026 · 3.49 FIP | 25 | SU | 3.49 | 21.9% | 10.3% | 1.7% | .291 | 3.65 | 18.9% | 6.4% | 50 | +0.16 | 3.16 | 153 | 82 |
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.