2026 MLB Rookie of the Year Race — AL & NL Contenders Ranked by NUT
Rookie of the Year is the hardest award to judge from a box score. First-year players arrive at different points in the season, in different ballparks, in different roles — one debuts on Opening Day and takes 590 plate appearances, another comes up in May and takes 260. Home runs and RBI reward the guy who got the most chances, not the guy who did the most with them.
NUT Score is built for exactly that problem: one number for a player’s production, park- and league-adjusted, on the same scale for everyone. So here are the 2026 Rookie of the Year fields ranked by NUT rather than by narrative. All values run through August 30 and update daily on the live board.
How to read the grades
Hitters and pitchers run on separate NUT scales, so the letter matters more than the raw number when you compare across the two. A pitcher at +1.5 grades A; a hitter needs +3.0 for the same letter. That is why Parker Messick’s +1.6 outgrades Kevin McGonigle’s +2.0 below — a full season of mid-rotation innings is worth more relative to other arms than McGonigle’s bat is relative to other bats.
The season scale tops out at S (Nutty), then A (Great), B (Good), C (Average) and down. No rookie in either league has cleared the A line as a hitter this year, which tells you something about the class on its own.
AL Rookie of the Year Race by NUT
The AL race is three names inside 0.2 NUT. Kevin McGonigle leads on volume and on-base skill — a .377 OBP from a shortstop across 594 plate appearances, more than any rookie in baseball has taken. Chase DeLauter has the better rate line (.293/.365/.454) in 114 fewer trips, so a strong final month flips this.
The interesting case is Munetaka Murakami. He is hitting .218, which in most award conversations ends the argument. NUT weighs on-base and slugging rather than batting average, and Murakami’s .357 OBP and .497 SLG — 29 home runs, the most of any rookie in the American League — put him within 0.2 of the lead. He walks enough to survive the average. Whether voters see it that way is a different question, and the gap between his NUT rank and his likely ballot position is the cleanest example in either league of what a rate-blind stat does to a hitter.
Parker Messick is the arm to watch. 161 innings of 2.46 ERA ball with 161 strikeouts is the only A-grade full workload in the AL rookie class, and if the voting splits between McGonigle and DeLauter, a starter with a full season of innings is exactly the profile that wins from third place.
NL Rookie of the Year Race by NUT
TJ Rumfield’s +2.3 is the highest mark of any rookie in either league, and the number survives the obvious objection. He plays half his games at Coors Field, and NUT is park-adjusted — his line is already discounted for the thin air before it reaches the leaderboard. A .380 OBP from a first baseman in Colorado is worth less than the same line in San Diego, and the +2.3 is what it looks like after that haircut.
Sal Stewart will get the counting-stat vote: 30 home runs and 104 RBI, both the most of any rookie in baseball. NUT has him second because his .337 OBP is 43 points behind Rumfield’s, and RBI is largely a function of how often the men in front of you reach base. If you want to see how those two profiles actually stack up, drop them into the comparison tool.
The best per-trip rookie hitter in the league is Esmerlyn Valdez, who has slugged .535 in only 259 plate appearances since a May 22 debut — the highest slugging percentage of any qualified rookie, in less than half the playing time of the two names above him. Chase Burns anchors the NL rookie pitching class with 164 strikeouts across 139.2 innings, the only A-grade arm in the field.
The best rookie pitchers in baseball
Pitcher NUT is built on strikeouts, walks, and home runs with defense removed, so these grades describe the arm rather than the fielders behind it. Across both leagues:
Grant Taylor’s 92 strikeouts in 71 innings is the loudest rate in the class — 11.7 per nine — but the workload gap is the whole story of this list. Messick has thrown 90 more innings at a comparable ERA, and NUT is a counting stat at heart: it accumulates. Half a season of excellent is worth less than a full season of very good.
Who counts as a rookie?
A player keeps rookie status until they exceed 130 at-bats, 50 innings pitched, or 45 days on an active rosterbefore September 1. That last clause is why some players who debuted last August are still eligible this year and others are not, and it is also why the boards above are built from at-bat and innings totals rather than from debut dates — a September cameo in 2025 does not spend a player’s eligibility.
It is worth knowing the September wrinkle too: from September 1 through the end of the regular season, active rosters expand from 26 to 28, and days accrued during that window do not count against the 45-day rookie clock. Every call-up shows up in the transactions tracker as it happens, so the bottom of these lists will move over the final month.
One caveat on the boards: players are included once they clear the app’s season qualifying bar, so a rookie called up in the last few weeks will not appear until the sample supports it.
Track the race yourself
These standings move nightly. The NUT leaderboard sorts by last 7 days, last 30, or full season, filterable by league and position — the fastest way to see whether a rookie is actually closing or just having a loud week. Every name above links to a full player page with the season NUT, the rolling windows, and the year-by-year history.
Want to follow a specific rookie the rest of the way? Add them to the player tracker and check one page instead of ten.
Related
Both Rookie of the Year races run to Game 162, and the AL one is close enough that a single hot week decides it. The live NUT board — last 7, last 30, or full season — is at baseballnut.app/stats, updated daily.