Prospect Spotlight: Aidan Miller, SS, Philadelphia Phillies
The 2023 first‑rounder has raced to Double‑A at 21, pairing burgeoning plate discipline with suddenly plus baserunning. Can the bat catch up in time to headline the next Philly core?
| Height / Weight | B/T | Drafted | Org. Rank | MLB Rank | Rule‑5 EL | ETA | |
|---|---|---|---|---|---|---|---|
| Aidan Miller | 6'1" / 205 lbs | R/R | 2023 1st (#27) | #2 (PHI) | #18 (MLB Pipeline, July 30 ’25) | Dec 2027 | Mid‑2026 – early 2027 |
1. 2025 Performance Snapshot
| Year | Level(s) | G | PA | AVG | OBP | SLG | HR | SB | BB% | K% | wRC+ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024 | A / A+ / AA | 102 | 462 | .261 | .366 | .446 | 11 | 23 | 12.1 | 21.6 | 133 |
| 2025 | AA (Reading) | 79 | 349 | .222 | .344 | .355 | 8 | 37 | 14.6 | 26.6 | 106 |
Held top‑half production in the Eastern League despite a batting‑average dip, but held up by a top‑10 walk rate (14.6 %) and league‑leading 37 steals.
2. Under‑the‑Hood Trends
| Metric (2025 AA) | Value | 2024 MiLB | Note |
|---|---|---|---|
| ISO | .133 | .185 | Raw pop still present despite tougher arms |
| BB % | 14.6 % | 12.1 % | Walks up two points YoY |
| K % | 26.6 % | 21.6 % | Needs trimming vs. spin |
| Spd Score | 7.1 | 7.4 | Elite runner; 37‑for‑44 SB |
| BABIP | .295 | .323 | Normalizing after FSL‑inflated ’24 |
| 90th EV | 105 mph | 105 mph | Underlying juice unchanged |
3. Scouting Grades (Present / Future)
| Hit | Game Pwr | Raw Pwr | Run | Field | Arm |
|---|---|---|---|---|---|
| 50 / 60 | 40 / 50 | 55 / 60 | 60 / 55 | 55 / 60 | 50 / 55 |
4. Organizational Fit & MLB Outlook
With Bryson Stott entrenched at 2B and Trea Turner aging, Miller’s plus glove gives him a real path to short by 2027. The Phillies front office confirmed no immediate position switch; focus remains on lifting the ball more consistently.
5. Sentiment & Market Buzz
- MLB Pipeline: jumped to #18 overall in the July market‑correction Top 100, highest of any Phillies bat.
- FanGraphs: FV 55; second‑highest Phillies bat behind Painter.
- Trade‑deadline chatter: Listed among eight Top 100 names “most likely to be moved” thanks to Philly’s win‑now stance.
6. Bowman Hobby Outlook (July 2025)
| Card | Recent RAW | PSA 10 High |
|---|---|---|
| 2024 Bowman Chrome 1st Auto (Base) | $35-50 | $125 |
| Blue /150 Auto | $550 | — |
| Purple /250 Auto | $225 | — |
Prices remain below Justin Crawford’s and one‑eighth of Jackson Holliday’s equivalent color autos, autos still look like value plays ahead of a possible AAA stint in 2026.
7. Risk / Recommendation
Risks: elevated AA K‑rate, ground‑ball lean, crowded MLB infield.
Recommendation: Buy‑and‑Stash. Top‑20 status plus big‑market bump aren’t yet baked into card prices.
Now an MLB Top‑20 prospect, Miller pairs elite wheels and patience with sneaky raw pop. If the loft comes, Philadelphia could finally have its next homegrown shortstop—and collectors who buy now may beat the inevitable price climb.