The Semien Sinkhole: Why the Mets Can't Afford to Wait on a Regression

In the high-stakes game of roster construction, there is a fine line between loyalty to a veteran and a refusal to acknowledge a collapse. Right now, the New York Mets are dancing on that line with Marcus Semien.

Let's be clear: this is my opinion, but the trajectory here is alarming. As Sports Illustrated first reported, the Mets are currently staring at a massive liability at second base, and if they don't pivot their strategy now, they are simply paying a premium to watch a player's career fall off a cliff.

As reported by Sports Illustrated, the acquisition of Semien was a gamble from the start. To get him, the Mets traded away outfielder Brandon Nimmo to the Texas Rangers. President of baseball operations David Stearns was reportedly on a "run prevention crusade" all winter, intending to shore up the infield defense. But the reality on the field has been a far cry from the plan. Sports Illustrated notes that Semien's defense has not lived up to the hype, and his offensive production has plummeted.

When you look at the numbers provided by Sports Illustrated, the regression is undeniable. Following a 9-4 win over the Marlins on Labor Day, Semien was hitting .220/.284/.350 with a .634 OPS, totaling 14 home runs and 45 RBIs. This isn't just a slump; it is a downward trend that has spanned several years. With Semien turning 36 on Opening Day, there is every reason to believe the decline will accelerate.

Yet, the Mets seem trapped by their own contract. Semien is slated to earn $26 million next season and has two years remaining on his deal. Sports Illustrated describes this as an "albatross of a contract," making it unlikely that New York can move him. While David Stearns has praised Semien's work ethic and described him as a "steadying force" in the clubhouse, leadership and work ethic don't drive in runs or stop balls in the gap.

Stearns has admitted that the team needs more from Semien offensively next year, but asking for a resurgence from a 36-year-old who is trending sharply downward is a steep ask. The Mets cannot afford to enter 2027 with Semien as an everyday second baseman without a concrete plan to limit his damage.

If the Mets want to save their window, they need to stop treating Semien's starting role as a given. As Sports Illustrated suggests, the team needs to introduce real competition in spring training. Whether it is top prospect Jefferson Rojas—who possesses an ideal skill set for the position—or other candidates like Émilien Pitre and Mitch Voit, the Mets must create a scenario where Semien has to fight for his reps.

There is a path forward that doesn't involve a total collapse: a platoon or a job share. Bringing in Rojas could not only challenge Semien but also allow Francisco Lindor to be managed more carefully at shortstop. Even a potential job share with Brett Baty, if he remains with the team, could provide the necessary relief.

Giving Semien the starting job again in 2027 might be the most likely outcome, but it should come with a razor-thin leash. The Mets are paying for a veteran's presence, but they cannot afford to pay for a vacancy in production. If they don't prepare a young prospect to take over the moment Semien falters, they aren't just managing a decline—they're subsidizing it.