
Mariners acquire slugging first baseman Josh Naylor from Diamondbacks: Source
The Mariners have acquired 1B Josh Naylor from the Diamondbacks, source tells @TheAthletic.
— Ken Rosenthal (@Ken_Rosenthal) July 25, 2025
Naylor ranked No. 17 on The Athletic's trade deadline big board.
A left-handed-hitting first baseman, Naylor entered play on Thursday with .292/.360/.447 slash line, with 11 homers and 59 RBI, good enough for a 124 OPS+. His contributions have been worth 1.0 bWAR.
The Cleveland Guardians traded Naylor to Arizona in December ahead of his final year before free agency. In exchange, the Diamondbacks sent pitcher Slade Cecconi and the No. 70 draft pick to Cleveland. Naylor was coming off a season in which he socked a career-high 31 homers and was named to his first All-Star team. This year, however, he has more resembled his 2023 version, with a healthier batting average and on-base percentage, an impressively low strikeout rate and a more modest home run total.
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Still, with the Diamondbacks on the periphery of contention and with ace Corbin Burnes on the shelf because of elbow surgery, a rental like Naylor was an obvious trade candidate. Naylor turned 28 in June, so though the free-agent market isn't always kind to first basemen these days, he should be young enough to command a solid, multiyear contract.

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