William Kempner
These ratings blend a limited performance sample with a historical peer baseline and remain provisional.
About these ratings
Tool ratings combine recorded performance with statistical estimates. Speed, arm, and fielding include outcome-based estimates rather than direct physical measurements.
Limited MLB evidence: 12.5% MLB and 87.5% level-adjusted minor-league estimate.
Minor-league estimate: 40.6% observed statistical weight and 59.4% historical peer baseline; individual tools use their own sample weights.
* On NTV, this indicates estimated or unverified inputs. CE uses an asterisk only when current contract information is unavailable.
CE uses the best available contract information, including partial terms, estimated salaries, and projected team control. CE shows an asterisk only when current contract information is unavailable; free agents without a current agreement use 100*.
2026 win contribution
0.61 Player Wins · 0.26 expected from replacement · 0.35 wins above replacement
Includes contributions to every team played for in 2026. Perf expresses wins above replacement on a scale where 100 is average. How the win totals reconcile
Six-tool graphs show percentiles from available performance evidence. Speed uses baserunning outcomes; Arm uses position-adjusted throwing outcomes. Movement describes tracked pitch movement within pitch type. Minor-league comparisons account for competition level; unavailable measurements display MD.
Edge Profile
Edge combines Perf, Stick, and Carry to show how valuable a player is right now. With a Perf of 90, Stick of 105, and Carry of 95, William Kempner sits in the 61st percentile, 77th percentile, and 65th percentile in those areas. His 89 Edge lands in the 63rd percentile and ranks 171st among relief pitchers.
Stick Profile
Stick looks beyond the immediate results and estimates what should hold over a larger sample. William Kempner's 105 Stick suggests he is performing below what his underlying profile supports. It also places him in the 77th percentile and ranks 177th among relief pitchers.
Perf Profile
Perf measures season wins above replacement after allocating each team's actual wins to its players. It includes William Kempner's contributions to every team he played for. His 90 Perf is below average on a scale where 100 is average and 20 points is one standard deviation. It sits in the 61st percentile and ranks 181st among relief pitchers.
Carry Profile
Carry places Perf in the context of the roster around a player and includes a bounded clutch adjustment for offense, pitching, and defense when available. Close games and later innings earn more weight, and difficult defensive plays receive their own credit. His clutch runs are offense +0.0, pitching +0.6, defense +0.0. The strongest rated teammates are Otto Lopez at 139, Xavier Edwards at 122, and Heriberto Hernández at 115. William Kempner has contributed about as much as his own Perf suggests, resulting in a Carry of 95.
LI Profile
LI looks at how much useful baseball a player may still have ahead of him. At age 25, William Kempner carries a 99 LI, which points to a steady near-term outlook without a major longevity advantage. That places him in the 10th percentile and ranks 3085th among relief pitchers.
CE Profile
CE compares expected production with the money and years attached to a contract. The model uses a 6 seasons control horizon, $0.1 million average annual value, and about $0.1 million in contract-scenario costs for William Kempner. Options and arbitration can make those years or costs conditional; manual contract inputs may lag new agreements. His 100 CE is close to a fair exchange between salary and production, placing him in the 11th percentile and 3417th among relief pitchers.
NTV Profile
NTV estimates William Kempner's value on a neutral trade market before the needs of a specific club are considered. His +19* NTV reflects his present ability, expected future value, age, contract, control, positional demand, and risk. That mark sits in the 89th percentile and ranks 60th among relief pitchers. William Kempner carries clear positive value and should return a useful major league piece or prospect package.