What happened: Leo De Vries is set for season-ending shoulder surgery, changing the near-term balance of San Diego's deal for Mason Miller. The Padres acquired Miller from the Athletics in a trade built around De Vries as the headlining prospect.
Why it matters: San Diego made the move for immediate bullpen impact, and Mason Miller has already become a central late-inning piece. De Vries' lost season sharpens the short-term return for the Padres while delaying the prospect upside the Athletics bought in the swap.
By the numbers: Miller has a 1.04 ERA with 162 strikeouts in 86.2 innings over 80 appearances for San Diego. De Vries hit .290 with 13 home runs and 55 RBI in 93 games before the shoulder injury, and Miller is under team control through 2030.
What to watch: The next checkpoint is De Vries' surgery and how his recovery shapes his path back. San Diego's side of the ledger stays tied to Miller's role in the playoff push.