The Mason Miller trade had lived comfortably in baseball’s favorite gray area: the rare blockbuster that seemed to help both sides. San Diego got the kind of late-inning weapon teams dream about, and Oakland landed Leo De Vries, a teenage shortstop whose ceiling looked like a franchise anchor. For a while, that was enough to keep the deal in the “win-win” column.
That balance got a lot shakier this week.
De Vries is set to have surgery on Sept. 18 to repair a torn anterior labrum in his right shoulder. The recovery could stretch as long as eight months, which would push his return well into 2027.
He hadn’t played since Aug. 14, and the expectation had been that he would reach Triple-A before the 2026 season was over. Instead, one of the game’s top prospects is facing a long rehab stretch.
It’s a rough turn for De Vries, and it nudges the trade board a little farther toward the Padres. But the injury doesn’t create some new revelation about the deal. San Diego already had plenty of evidence that the move was the right one.
Miller has been electric from the moment he arrived. In 22 regular-season appearances with the Padres, he put up a 0.77 ERA and struck out 45 of the 83 batters he faced. Then he opened his postseason career by striking out eight straight Cubs.
He’s kept rolling in 2026. Through Sept.
9, Miller has a 1.17 ERA with 113 strikeouts in 61 1/3 innings. That’s the kind of production that leaves no room for second-guessing at the back end of a bullpen.
San Diego paid heavily to get him. The Padres sent De Vries, Braden Nett, Henry Baez and Eduarniel Núñez to the A’s for Miller and JP Sears.
But the logic was always there: Miller’s dominance, plus team control through 2029, gave A.J. Preller a closer for now and for the years ahead.
So far, Miller has delivered exactly that.
De Vries had been doing his part, too. In his first full season in the A’s organization, he hit .290/.378/.458 with 13 home runs, 21 doubles and 34 stolen bases in 93 Double-A games.
MLB Pipeline had him ranked as the No. 2 prospect in baseball. That’s why this had felt like a clean trade for both clubs.
Now the injury adds a much harsher layer of uncertainty. Surgery on a throwing shoulder can’t be treated like a neat timetable. Recovery windows are only estimates, and nobody knows yet whether De Vries will return to the same path, or how long it will take for his arm strength, swing and confidence to come back.
What shouldn’t happen is the easy leap to declaring his future damaged beyond repair. And it’s just as flimsy to turn this into some kind of hindsight trophy for the Padres.
There’s no sign San Diego made the trade because it saw this coming. This is baseball being cruel in its usual, unsentimental way.
The Padres can be thrilled with what Miller has given them. They can also feel bad for a player who was developed in their system and is now losing precious time at 19.
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