Aidan Miller

21-Year-Old ShortstopSS
Philadelphia Phillies AAA
Out
Injury Undisclosed
Est. Return 2/1/2026
2025 Fantasy Outlook
One of the best pure hitters from the 2023 prep class, Miller opened 2024 at Single-A earned two promotions, finishing his first full pro season with five games at Double-A. He was one of the older high schoolers in his class, so Miller will turn 21 in June, but he has performed well enough to stay ahead of his peers on the march to the majors. He spent the majority of his season at High-A, where he slashed .258/.353/.444 with six homers, 12 steals, an 11.6 percent walk rate and a 22.1 percent strikeout rate in 58 games. Miller hasn't moved off shortstop yet, but it has long been thought that third base might be his long-term home. It's unclear whether he'll end up being a power-over-hit player, or just a well-rounded hitter who hits for average and power. The righty-hitting Miller stole 23 bases on 28 tries last year, but public scouting outlets give him average run times at best. He should get a long run at Double-A to begin the year, before potentially finishing the year at Triple-A, which could set up a 2026 MLB debut. Read Past Outlooks
RANKS
Rest of Season From Preseason
Signed a $3.1 million contract with the Phillies in July of 2023.
Pulls out of Arizona Fall League
SSPhiladelphia Phillies  AAA
October 7, 2025
Phillies farm director Luke Murton said that Miller will no longer participate in the Arizona Fall League due to "some nagging things physically," Scott Lauber of The Philadelphia Inquirer reports.
Analysis
There doesn't seem to be any concern that whatever physical issues Miller is dealing with will linger, but the Phillies have decided it's best to give their top prospect some rest. Miller slashed .264/.392/.433 with 14 home runs and 59 stolen bases between Double-A Reading and Triple-A Lehigh Valley in 2025 and could be ready to make his major-league debut with Philadelphia next season.
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Batting Stats
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Minor League Game Log
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Minor League Left/Right Batting Splits (AAA)
Since 2023
 
 
+18%
OPS vs RHP
2025
 
 
+4%
OPS vs LHP
2024
No Stats
2023
No Stats
OPS PA R HR RBI SB AVG OBP SLG
Since 2023vs Left .900 6 0 0 .400 .500 .400
Since 2023vs Right 1.062 31 1 1 .318 .516 .545
2025vs Left .733 6 0 0 .400 3.000 .400
2025vs Right .704 31 1 1 .318 15.032 .545
2024vs Left 0 0 0 0 0 0 0 0 0
2024vs Right 0 0 0 0 0 0 0 0 0
2023vs Left 0 0 0 0 0 0 0 0 0
2023vs Right 0 0 0 0 0 0 0 0 0
Prospect Rankings History
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Climbs to Triple-A
SSPhiladelphia Phillies  AAA
September 8, 2025
The Phillies promoted Miller from Double-A Reading to Triple-A Lehigh Valley on Monday, Todd Zolecki of MLB.com reports.
Analysis
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Running wild at Double-A
SSPhiladelphia Phillies  AAA
July 10, 2025
Miller is slashing .261/.400/.457 with three home runs and 16 steals in his last 25 games for Double-A Reading.
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Cut from big-league camp
SSPhiladelphia Phillies  AAA
March 4, 2025
The Phillies reassigned Miller to minor-league camp Tuesday, Todd Zolecki of MLB.com reports.
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Bumped to Reading
SSPhiladelphia Phillies  AAA
September 1, 2024
Miller was promoted to Double-A Reading on Sunday, MLB Pipeline reports.
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Climbs to High-A
SSPhiladelphia Phillies  AAA
June 10, 2024
The Phillies promoted Miller from Single-A Clearwater to High-A Jersey Shore on Monday, Jonathan Mayo of MLB.com reports.
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Latest Fantasy Rumors
Adjusts swing setup
SSPhiladelphia Phillies  AAA
April 29, 2024
According to Alex Coffey of The Philadelphia Inquirer, Miller tweaked his swing setup during the offseason in an attempt to be more consistent against fastballs.
Analysis
The 27th overall pick in the 2023 First-Year Player Draft, Miller played in 20 games between rookie ball and Single-A Clearwater last season. Miller has enjoyed a strong start to his first full professional season in 2024, as he has a .327/.379/.519 slash line with two homers and six steals through 12 games. The 19-year-old is a couple years away from potentially seeing the majors but is already arguably Philadelphia's top prospect.
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