The Mariners need offense this winter, and if the Phillies ever decide Bryce Harper is truly available, Seattle at least has to make the call.
That doesn’t mean this is a simple fit. In fact, the whole idea runs straight into John Stanton’s long-held philosophy about when and how the Mariners should spend. Harper is still a star, but he’s also 34, and the kind of commitment Seattle owner John Stanton has repeatedly shown he prefers to avoid.
Harper’s name belongs in the conversation because Philadelphia’s offseason questions are real, too. The Phillies’ season ended shortly after Seattle’s wrapped on September 27, and both teams are now trying to patch up a flawed contention model. That could mean the Phillies explore moving Harper or Kyle Schwarber, though Harper appears likelier to be the one on the move.
Ken Rosenthal of The Athletic hinted at that on October 2, noting that the Phillies would be "reluctant" to move Schwarber. He described Schwarber as their "heart and soul," while also pointing to recent disagreements Harper has had with Dave Dombrowski and Don Mattingly.
On the field, Harper still looks plenty useful. He led the NL in walks this year, hit 29 home runs, and posted a 131 OPS+. He also has $125.7 million left on his contract through 2031, which is not an absurd number for a player of his caliber.
The catch is what it might take to get him to approve any deal. Rosenthal suggested that if Harper were going to waive his no-trade clause, the acquiring club may need to offer an extension. That’s where Seattle’s path gets rocky.
Stanton laid out his thinking clearly in September in remarks to Adam Jude of The Seattle Times, saying:
"We have been willing to spend money when we think it’ll make a difference. We also believe in players we acquire in the draft, players we’re able to extend.
I’m excited about having a 25-year-old Julio Rodríguez signed for over a decade, that throughout his 20s he’ll be a Seattle Mariner, and hopefully for the rest of his career. But particularly through his 20s he’ll be here.
And bluntly, I’d much rather do that than sign a 30-year-old or 31-year-old star player who had been a star in their 20s to play through their 30s and maybe through 40 years old. I think you’re far better off with players earlier in their career in the long term, and they happen to be less expensive because of the way the economics of baseball work.
That’s the reason for the payroll that we’ve got. It’s the product of hiring the right players and have that fit."
That’s not exactly a road map to signing Harper if he were a free agent, let alone extending him beyond his current deal. Even a modest add-on would push the total commitment into uncomfortable territory.
So if Seattle wanted to make this happen, it would probably have to get creative through a trade. One proposal would send Harper and Orion Kerkering to the Mariners in exchange for Josh Naylor, George Kirby and Michael Arroyo.
That deal would require some moving parts of its own. Naylor would have to waive his no-trade clause, and he might need a reason to do it as well.
Baseball Trade Values considers the framework fair based on surplus value, and it’s easy to see why it works for Philadelphia. The Phillies would trim money by moving a first baseman owed $125.7 million over five years for one owed $81.2 million over four years. They’d also bring back Kirby, an All-Star starter with two years of club control left, plus Arroyo, a top-100 prospect whose bat could matter more than his defensive questions in Citizens Bank Park.
For Seattle, the logic is more aggressive but not absurd. Harper is still the better hitter than Naylor, even with the age difference.
Naylor brought obvious value at times, but he also played through a wrist injury and finished with -0.2 rWAR in 2026. Harper’s bat looks more likely to stay above average beyond 2026.
The Mariners can also afford to part with Kirby more than most clubs could. He’s part of a deep six-man rotation, and top prospect Ryan Sloan is close enough to begin pushing for a role. Arroyo would be harder to give up, though that assumes he’s destined for left field at T-Mobile Park, and that part is hardly guaranteed.
From a payroll standpoint, the math is less intimidating than it first appears. Harper’s contract would add $125.7 million, but Seattle would be clearing the $81.2 million owed to Naylor and roughly $25 million in projected salary for Kirby through arbitration. Even if the Mariners added two more years and $50 million to Harper’s deal, the extra payroll commitment would look closer to $70 million than $175 million.
Kerkering, meanwhile, would be an appealing add-on. He’s just 25, controlled through 2029, and has already put together a career 127 ERA+ and 10.2 K/9 in 198 major league appearances. He’s fallen out of favor in Philadelphia, but he could still become a useful multi-year bullpen piece if Seattle can clean up the rough edges.
None of this makes Harper likely to end up in Seattle. It’s more of a blueprint for how the deal would have to come together if the Phillies actually made him available. But if that happened, the Mariners would at least have a path - and then it would come down to how bold Stanton and Jerry Dipoto were willing to be.
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