Aidan Miller

21-Year-Old ShortstopSS
Philadelphia Phillies AAA
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.
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
After earning a pair of promotions in 2024, Miller had up to this point spent the entire 2025 season at Reading, slashing .259/.382/.427 with 13 home runs, 52 stolen bases and a 14.9 percent walk rate over 489 plate appearances. Miller had opened September by going 8-for-19 with two extra-base hits, two stolen bases and a 9:4 K:BB in six games, with his hot start to the month convincing the Phillies that he was ready for a stiffer test. Though Miller is likely to remain at the Triple-A level for the rest of the season, a call-up to the big leagues can't be completely discounted if the hamstring strain that star shortstop Trea Turner suffered in Sunday's loss to the Marlins proves to be a long-term concern. For now, Edmundo Sosa would appear to be the top choice to step in as the Phillies' everyday shortstop if Turner is forced to go on the injured list.
Read More News
Batting Stats
Loading Batting Stats...
Minor League Game Log
Calculate Stats Over Time
Just click on any two dates.
Loading Minor League Batting Game Log...
Prospect Rankings History
Advanced Batting Stats
Loading Advanced Batting Stats...
Additional Stats
Games By Position
Defensive Stats
Loading Games Played by Position...
Loading MLB Defensive Stats...
Batted Ball Stats
Loading Batted Ball Stats...
Stats Vs Upcoming Pitchers
Want more matchup stats?
Loading Matchup Stats...
Our full team depth charts are reserved for RotoWire subscribers.
Subscribe Now
Recent RotoWire Articles Featuring Aidan Miller See More
Recent RotoWire Articles Featuring Aidan Miller See More
More Fantasy News
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.
Analysis
Subscribe now to instantly reveal our take on this news.
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.
Analysis
Subscribe now to instantly reveal our take on this news.
Bumped to Reading
SSPhiladelphia Phillies  AAA
September 1, 2024
Miller was promoted to Double-A Reading on Sunday, MLB Pipeline reports.
Analysis
Subscribe now to instantly reveal our take on this news.
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.
Analysis
Subscribe now to instantly reveal our take on this news.
Best hitter in Florida State League
SSPhiladelphia Phillies  AAA
May 15, 2024
Miller is slashing .337/.420/.570 with four home runs, nine steals and a 19 percent strikeout rate in 100 plate appearances for Single-A Clearwater.
Analysis
Subscribe now to instantly reveal our take on this news.
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.
See All MLB Rumors