The Mariners have already made one major infield investment, but Teruaki Sato could force them to decide how much more they’re willing to spend.
Seattle committed $92.5 million to keep Josh Naylor at first base. Now the club is being linked to a player who could bring far more power to the other side of the diamond, and maybe a much bigger price tag with him. Adam Jude of The Seattle Times reported that the Mariners are searching for a veteran who can handle third base or shortstop next to Colt Emerson, and Sato - a 27-year-old left-handed slugger posted by the Hanshin Tigers - fits the kind of bat that could change the conversation.
The question is whether John Stanton would go that far.
Sato could command close to $100 million, and Seattle’s interest, if it goes any further, would come with a posting fee on top of the contract. Under MLB’s posting rules, a $100 million deal would also require a $16.875 million release fee for Hanshin.
Even if Sato signed for the same $92.5 million Seattle gave Naylor, the Mariners would still owe Hanshin another $15.75 million. That would make him a more expensive overall bet than Naylor, even though Seattle hasn’t seen Sato take a major league at-bat.
That’s part of what makes this such a fascinating test for the front office. Stanton told The Seattle Times in September that he prefers to make long-term commitments earlier in a player’s career.
That thinking could help explain why Seattle may be hesitant on Randy Arozarena and Seiya Suzuki, both of whom are entering their age-32 seasons. It also helps frame Sato as a possible target.
He’s a year younger than Naylor was when he signed.
And the bat is real.
Sato hit .306/.383/.609 with 39 homers and 40 doubles in 143 games for Hanshin in 2026. The year before, he launched 40 homers and won Central League MVP.
He also struck out 164 times in 614 plate appearances this past season, a 26.7 percent rate. That kind of swing-and-miss is easier to live with when the power plays.
The bigger question is how often that power shows up once major league pitchers get a look at him and start attacking him with a plan.
For Seattle, the fit is about more than just filling a hole. The Mariners finished 28th in the majors in runs, and one of the most intriguing bats available plays a position they need. If Sato’s offense translates, he could give the lineup a different ceiling, especially in games when Julio Rodríguez and Cal Raleigh don’t carry the load.
There’s also the defensive side of the equation. The Mariners want a veteran who can move between third and short while Emerson develops, but Sato would change that balance.
Seattle would have to be comfortable with him at third every day. If the club views him as a first baseman in the long run, then the fit gets a lot less clean, especially after the Naylor commitment.
Still, if Sato can handle third, the appeal is obvious. The Mariners can find another way to cover shortstop.
A middle-of-the-order bat is harder to replace. And if Emerson has growing pains, Seattle would rather not force him to hit his way through them.
Sato may end up too expensive, and the Mariners could decide the money is better spent somewhere else. But if the front office believes his power belongs in the middle of the lineup, this is the kind of player that could push Stanton to put a real number on his stated preference for paying for prime years.
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