The Arizona Fall League has become a useful runway for the Phillies’ young talent, and Aidan Miller is making the most of it.
Philadelphia sent 10 players to the AFL this year, split evenly between five position players and five pitchers. For some, it’s a chance to pick up extra reps before an offseason shadowed by the looming labor lockout. For Miller, it’s also a chance to claw back time lost to injury.
The 21-year-old is coming off a back injury that wiped out nearly his entire 2026 season. A unanimous top 100 prospect in the sport and the No. 2 prospect in the Phillies’ system behind right-handed pitcher Gage Wood, Miller managed only eight games near the end of the year before landing on the Arizona Fall League roster as a late addition. He’s playing third base there, and that experience could matter when Philadelphia starts mapping out its 2027 picture.
So far, the bat has done most of the talking.
Through nine games and 25 at-bats, Miller is hitting .360/.636/.560 with three doubles and one triple. His 1.196 OPS ranks third in the Arizona Fall League, trailing only shortstop Welbyn Francisca and catcher Jack O’Dowd.
He’s also chipped in three stolen bases, with one caught stealing, but the real eye-opener has been his command of the strike zone. Miller owns an eye-popping 2:1 walk-to-strikeout ratio and leads the AFL with 18 walks. The next closest player, shortstop Arjun Nimmala, has 13.
That kind of production only strengthens the case for Miller as a legitimate factor in Philadelphia’s next infield conversation. Alec Bohm is headed for free agency, as is Luis Arraez, and that could create room on the major league roster.
The path isn’t exactly crowded, either. Bryce Harper has first base covered.
Kyle Schwarber is there as well. Bryson Stott is the only other player clearly locked into a role, whether that ends up being at second base, third base or shortstop.
Trea Turner still has to secure his spot at shortstop with defensive improvement, and there’s even a scenario where he moves to the outfield.
For Miller, the door is open enough to matter. If he keeps producing in the AFL, third base in particular could become part of a real major league conversation. He’s already shown progress at shortstop, and every rep now only helps his case.
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