Athletics predicted to get MLB debut from 19-year-old top prospect in Mason Miller trade

The Athletics have been building up their team from the ground up with a ton of young players making their MLB debuts and landing extensions.

Tyler Soderstrom and, most recently, Jacob Wilson have signed extensions. If the A's can find a way to sign Nick Kurtz long-term, then the Athletics will be in an even better spot.

But, there is still room on the roster for more youth, and ESPN's David Schoenfield predicted the A's will see their top prospect, whom they acquired in the Mason Miller trade, make his MLB debut at 19 years old in 2026.

Athletics predicted to see MLB debut from 19-year-old prospect

"Leo De Vries (No. 11) will debut in the majors at 19 years old," Schoenfield writes. "... De Vries will have a really strong showing in the first five months of 2026 and give himself a chance to make his major league debut at that position in September."

This prediction, while it's a very bold one with the A's getting their 19-year-old top prospect into the Major Leagues in 2026, is a prediction that still has De Vries sitting in the minor leagues for most of the year.

But, even if De Vries can get up to the Major Leagues for a short period of time, it could give the A's a good look at the future of their franchise at his expected new position at third base. 

More: MLB Hot Stove tracker: Live updates on news, rumors, signings and trades for 2025 free agency

The A's top shortstop prospect could find a new home at third base for the Athletics, with Wilson sticking at shortstop after signing his big $70 million extension.

Last year in Double-A, De Vries hit .281 with a very strong. 910 OPS. After being traded to the A's, he proved he was worth moving on from Miller in a blockbuster trade with the San Diego Padres.

The Athletics seeing De Vries make his MLB debut this upcoming season would be incredible, as not only would it mean he's already shown enough, but that he could stick in the Majors as soon as 2027.

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