The Mets set foot in 2025 relying on a patchwork rotation to hold steady, but the gamble has backfired. Sean Manaea, signed for $75 million, and David Peterson, owed $4.6 million, were anticipated to provide stability to the franchise. Instead, inconsistency has left the club depending heavily on an unlikely source: 24-year-old rookie Nolan McLean. With postseason hopes hanging in the balance, the weight on his shoulders has only increased.

This was not the Mets’ actual blueprint. Their rotation “should” have been a middle-of-the-pack unit, combining two veterans floating around league-average ERA with a first-year arm trying to find his footing. But the picture changed swiftly. Manaea’s 5.60 ERA has shattered expectations, Peterson’s flashes of competence have not been enough to stabilize things, and all of a sudden, McLean, the rookie, has become the whole story. His early success, emphasized by a 1.37 ERA across his first few outings, has been an unusual flash in an otherwise shaky club.

McLean’s debut streak is historic—he’s just the second pitcher since 1913 to begin his career with at least four straight wins, a sub-1.50 ERA, and 25-plus strikeouts. The only other was Fernando Valenzuela back in 1981.

The breaking news is that McLean, despite debut jitters, has showcased maturity beyond his years. In his fourth start against Detroit, he stumbled in the opening inning, struggling with his sweeper and curveball. But then came the adjustment: discarding the softer stuff for harder velo pitches, attacking with confidence, and retiring 14 straight batters to secure his fourth win. “That’s what you call pitching,” manager Carlos Mendoza said, applauding the rookie’s capability to adapt mid-game.

Naturally, the question follows: Is McLean really ready to carry a franchise with October dreams? Teammates think so. Catcher Luis Torrens called him “excellent” after working with him for the first time, while Pete Alonso praised his “commitment to process,” mentioning that the work between starts has been as impressive as his results on the mound. Those inside the franchise are not treating him like a substitute; they are starting to believe he is the foundation.

The expanded view is even more telling. Statcast shows McLean has expertly handled mixing six pitches, often using his fastball to reset command and then leaning back on his breaking stuff later in games. It is a level of strategic thinking uncommon for a newcomer and it is why veterans are aiding him as the rotation’s most dependable arm right now. With Jonah Tong and Brandon Sproat also stepping up and Kodai Senga working toward a return, the Mets’ bet is not entirely lost. But make no mistake, their October hopes rest on whether McLean’s “flair of a superstar” translates into sustained dominance under pressure.

Yet McLean would not be asked to shoulder the load alone, as the Mets have decided to explore deeper into their pitching pipeline for reinforcements.

Mets Call on Brandon Sproat to Bolster Youth Movement

The Mets officially called up pitching prospect Brandon Sproat, joining Nolan McLean and Jonah Tong in a rotation that has abruptly become defined by youthful energy. Sproat, a second-round pick in the 2023 draft, brings a live arm and recent dominance in the minors. Over his last 11 outings at Triple-A Syracuse, he displayed a 2.40 ERA with 70 strikeouts across 59 innings, holding opponents to a meager .163 average. His addition underscores the Mets’ confidence in their farm system after missing on veteran upgrades at the trade deadline.

What makes this move so attractive is how perfectly it lines up with the Mets’ current identity transformation. McLean has already shown balance beyond his years, Tong’s arsenal has drawn comparisons to Tim Lincecum, and now Sproat adds another high-upside alternative. Ranked just behind McLean and Tong in MLB Pipeline’s organizational rankings, Sproat shows the third piece of a young trio tasked with leading the Mets toward October. As New York prepares for a vital series against the Reds and Phillies, their postseason fate may finally hinge on how quickly these newcomers adjust to the limelight.

As New York heads into a high-stakes September stretch, including a series with the Reds and Phillies—their Wild Card trajectory may ultimately hinge on how quickly the rookie trio adapts to big-league innings and how well veterans like Peterson and Manaea stretch deeper into games.