On Thursday, the Seattle Mariners kicked off the Major League Baseball trade deadline season by acquiring first baseman Josh Naylor from the Arizona Diamondbacks.
The 28-year-old Naylor is hitting .292 this season and instantly upgrades the Mariners situation at first base, which has been extremely rough, as noted by Justin Havens of Underdog Fantasy:
Josh Naylor this season:
.292/.360/.447/.807 OPS/123 wRC+
Mariners 1B this season:
.233/.298/.412/.711 OPS/105 wRC+
Josh Naylor this season:
— nugget chef (@jayhaykid) July 25, 2025
.292/.360/.447/.807 OPS/123 wRC+
Mariners 1B this season:
.233/.298/.412/.711 OPS/105 wRC+https://t.co/lZ1k7mWaOl
The M's have utilized Luke Raley, Donovan Solano and Rowdy Tellez primarily at first base this season, with Tellez getting designated for assignment in June. Naylor has 11 home runs and 11 stolen bases, while also driving in 59 runs. He's hitting .292.
An All-Star in 2024, he helped lead the Cleveland Guardians to the American League Championship Series last season.
Here's other basic information you need to know about Naylor:
Naylor is expected to arrive in Anaheim in time to play on Friday against the Angels. However, the Mariners will need to make a roster move for him. It's unclear what they'll do, but both Dominic Canzone and Miles Mastrobuoni have options remaining. Furthermore, the team could move on from Donovan Solano or Dylan Moore, who have both struggled.
According to Spotrac, the M's are picking up the $3.8 million remaining on Naylor's deal. For a team that is notoriously frugal in the offseason, this is a big deal. Remember, they also added $4 million or so this season when they picked up Leody Taveras earlier this year.
#MLB TRADE#Mariners Acquire
— Spotrac (@spotrac) July 25, 2025
1B Josh Naylor
2025: $3.8M
2026: UFA#Diamondbacks Acquire
LHP Brandyn Garcia (#13 prospect)
RHP Ashton Izzi (#16 prospect)
The popular @NumbersMLB account on "X" is reporting that he'll wear No. 12, which was last worn in 2024 by Samad Taylor.
1B Josh Naylor will wear number 12. Last worn by INF/OF Samad Taylor in 2024. #Mariners pic.twitter.com/5cd2jGuQtj
— MLB Jersey Numbers (@NumbersMLB) July 25, 2025
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