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.

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.