Prospect Power Benchmark Lab
Red Sox top prospect Franklin Arias completed a historic age-20 season with 25 HR, a .323 AVG, and a .957 OPS—becoming Boston’s first age-20 or younger prospect to hit 25 HR since Anthony Rizzo in 2010. Explore the cohort data, compare historic profiles, and test custom prospect slash lines.
Age-Relative HR Tier
99th %
Historical Elite
Slash Power Index
94.8
Weighted ISO & OPS
Prospect Similarity
A. Rizzo '10
BOS System Twin
MLB Rank Status
No. 3
Eastern Lg MVP
Milestone Cohort Comparison: Under-21 20+ HR Minor League Seasons
Source-grounded & Verified MiLB Milestones| Player | Org | Year | Age | Level | HR | AVG | OPS | wRC+ | Notable Outcome |
|---|
Franklin Arias & The Age-20 25-HR Benchmark
In minor league baseball history, hitting 25+ home runs at age 20 or younger in full-season upper minors (especially Double-A) is one of the rarest indicators of elite offensive ceiling.
- Anthony Rizzo (2010): The last Boston Red Sox prospect to achieve 25 HR at age 20 (playing between High-A Salem and Double-A Portland with 25 HR, 100 RBI).
- Rafael Devers (2017): Hit 25 total minor & major league HR at age 20, cementing his middle-of-the-order status.
- Franklin Arias (Current): Combined elite contact (.323 AVG) with 25 HR and a .957 OPS, taking Eastern League MVP honors and climbing to MLB No. 3 overall prospect status.
Evaluation Metrics Explained
Upper-minor performance is normalized by age relativity to identify genuine development leaps:
- Age Relativity Index: Double-A average age is typically 24.1 years. An age-20 hitter is more than 4 years younger than league competition.
- Isolated Power (ISO): Slugging minus batting average (.252 for Arias represents premier extra-base ability).
- Slash Power Index (SPI): A composite weighting of OPS, ISO, and age-discounted run-production factors to measure projectable major-league thump.