The New York Yankees Draft LHP Sean Duncan 63rd Overall
Height/Weight: 6-foot-3, 184 lbs
Age: 18 (turned 18 two months before the draft)
Consensus rank: No. 41 (Perfect Game), No. 66 (MLB Pipeline), No. 67 (Baseball America)
Commitment: Vanderbilt
If fellow day one Yankees pick Hunter Dietz’s draft fall was about an old injury, Duncan’s was about a brand-new one. The top prospect in Canada, a Perfect Game top-45 talent on raw ability, underwent Tommy John surgery just weeks before the draft. This was news that broke in June and cratered a stock that had been climbing all spring. Teams that had him valued in the late-first/early-second range suddenly had to price in 14-plus months of rehab before he throws a competitive pitch.
The Yankees, per ESPN’s Kiley McDaniel, had been rumored to be on Duncan at exactly this pick, reportedly eyeing him at a discount because of the surgery. The mock drafts nailed it: McDaniel’s final projection had Duncan to New York at 63 on the nose.
What makes Duncan unusual, and what makes him a Yankees pick, is that he’s not the typical raw prep arm you gamble on. He’s the rare high school pitcher whose carrying trait is strike-throwing.
The scouting consensus, led by Baseball America’s report, describes a projectable lefty with high-probability starter traits built on advanced command. His junior national team résumé backs it up: MVP of the 2024 JNT program, a standout against professional hitters in the Dominican Republic last October, and dominant showings at the Area Code Games and WWBA in Jupiter. In one league outing tracked by Prep Baseball Report, he carried a perfect game into the sixth and finished with 13 strikeouts against one hit and zero walks. Not to mention the fact that he did it across that season where he ran a 92-to-8 strikeout-to-walk ratio while holding hitters to a .065 average.
The pitch data is where the projection model lights up.
Fastball: Sits low-90s, was ticking up to 95 before the injury, with spin rates in the 2,500s. That’s a high-spin, ride-heavy heater that generates whiffs at the top of the zone despite modest velocity. That’s a vertical-approach-angle weapon, and it’s the pitch shape the Yankees have targeted in the draft for a half-decade.
Slider: Low-80s with plus spin in the 2,700s, flashing wipeout traits at Perfect Game’s Jupiter event.
Changeup: Flashes at least above-average with genuine arm speed, which is extremely rare for a prep arm and a strong starter indicator.
Stack it up and you have an 18-year-old lefty with three pitches that project average-or-better, elite spin talent, advanced command, and a track record against pro-caliber hitters through the Canadian JNT pipeline. Pre-injury, that’s a comfortably top 40 profile. The Yankees got it at 63.
Here’s the analytical reframe on drafting a fresh Tommy John: the Yankees aren’t buying Duncan’s 2026, they’re buying his 2028 and beyond. He’ll rehab entirely inside the organization’s system, meaning his first professional throwing program, his velocity build-back, and his pitch design work all happen under the Yankees’ staff rather than at Vanderbilt. For an organization that believes its development infrastructure is a competitive advantage, controlling the rehab from day one is a feature, not a bug. And at 18 years old, the actuarial tables on TJ recovery are about as favorable as they get. The return-to-performance rates for teenage pitchers are the strongest of any age cohort.
The signability math matters too. Pulling a Vanderbilt commit out of a college commitment usually costs over-slot money, but the surgery changed Duncan’s leverage. Three years in Nashville rehabbing on the SEC’s timeline versus a pro contract and immediate access to a big-league medical staff is not a hard sell.
Grade: A. Oppenheimer and his scouting department took a classic asymmetric bet. The downside is a lost pick, the same downside as any second-rounder. The upside is a top 40 talent, the best pitching prospect Canada has produced in years, acquired at a structural discount.