Padres Swing Big in Deal for Mason Miller

It was shaping up to be a boring trade deadline day, with the most interesting rental, Eugenio Suárez, already off the board and no huge prospects or stars in play. But the San Diego Padres don’t limit themselves to the guys that everyone knows are on the block. They swung a massive, unexpected deal earlier today, getting Mason Miller and JP Sears from the Athletics in exchange for Leo De Vries, Braden Nett, Henry Baez, and Eduarniel Núñez, as ESPN’s Jeff Passan first reported.
Miller burst onto the scene last year with one of the great relief seasons of the decade. He ramped up his fastball to nuclear velocities, sitting 100-101 mph and topping out above 103 en route to a 41.8% strikeout rate and a 2.49 ERA with peripherals that were even better. He did all that over 65 innings, a career-high workload for the 2021 draft pick. His fastball is a pitch modeler’s dream, all backspin and flat approach angle, and his slider is nearly unhittable for batters thinking “don’t get put on a poster by this fastball” from the minute they step into the box.
Miller’s 2025 encore hasn’t gone quite as well. For relievers not named Mariano Rivera, that tends to be the case. He’s still breathing as much fire as ever, but he’s aiming it a bit less effectively, and his walk rate has ballooned from 8.4% to 11.9%. Oh, don’t get me wrong, he’s still been very effective. Did you miss the part where I said he throws 103 with great shape and mixes in a nasty slider? Of course he’s still been effective. The decline has only been on the margins — ERA estimators in the high 2.00s instead of the low 2.00s, a low strand rate, and bam, suddenly he has a 3.76 ERA instead of a 2.49 mark. His stuff still looks really good, it’s just hard to maintain a two-handle ERA. Those are the numbers you put up when things go right, and 2025 seems more like an average year for Miller.
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