It didn’t take long for us to get an inkling that the 2026 rookie class could be special. This cohort of talented youngsters wasted no time announcing themselves on the major-league stage, with a plethora of rookies stealing the show on Opening Day.
Cardinals second baseman JJ Wetherholt and Mets outfielder Carson Benge both went yard for their first career hits. Tigers infielder Kevin McGonigle, at 21 years old, became just the 21st player since 1900 — and fourth-youngest of that group — to notch four hits in his big-league debut. After making his MLB debut in the postseason last October, Guardians outfielder Chase DeLauter not only homered on Opening Day but also began his regular-season career by homering in three straight games. That rare feat had been accomplished only twice before (Trevor Story, Kyle Lewis) — until White Sox first baseman Munetaka Murakami completed a three-game homer streak of his own to begin his MLB career. The following week, Konnor Griffin became the first position player to reach the majors as a teenager since Juan Soto in 2018.
It was quite the opening statement by this year’s crop of top prospects. And as the regular season comes to a close, it’s clear that this loud first impression was no early-season blip, but a sign of things to come. Here’s a look at the 2026 season through the lens of the rookies who have made the biggest impact — and the ones who could make a difference in October. (All stats through Sept. 23.)
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Home run heroes
Building off Opening Day, rookies produced new and unexpected home run fun facts all season. Wetherholt, Benge, DeLauter and Murakami were the first four of 16 players who hit home runs in their major-league debuts this year, an MLB record for a single season, surpassing 13 in 2022.
Among these dinger debuts were even rarer feats, the two most notable of which occurred in the same city. On June 6, White Sox outfielder Braden Montgomery — the fourth and final prospect acquired in the Garrett Crochet trade to arrive in Chicago — became the fifth player in MLB history to hit a walk-off homer in his debut. He smacked a two-run blast in the bottom of the 10th off veteran Braves closer Raisel Iglesias to topple Atlanta in one of the signature moments of this unexpected White Sox season.
A couple months later, more rookie home run history unfolded in Chicago, albeit this time courtesy of a visiting player. On Aug. 15 at Wrigley Field, St. Louis Cardinals outfielder Joshua Baez — having smacked 34 homers across 103 Triple-A games — made his grand entrance with not one, not two, but three home runs in his major-league debut, something that had never been done before.
Joshua Báez
Joshua Báez!
JOSHUA BÁEZ!!!The @Cardinals rookie has homered THREE TIMES in his MLB debut 🤯 pic.twitter.com/4FTBDw4dZx
— MLB (@MLB) August 15, 2026
Scan the upper echelon of the home run leaderboard, and you’ll find a trio of rookies who have made some history this year. On Aug. 29, Reds infielder Sal Stewart hit his 30th homer of the season, joining Hall of Famer Frank Robinson as just the second rookie in franchise history to do so. Only 2001 Albert Pujols (130), 2019 Pete Alonso (120) and 2017 Aaron Judge (114) have driven in more runs than Stewart (110) as a rookie this century. And perhaps most impressive, Stewart has appeared in every game this year for Cincinnati, starting all but one. If that continues, he’ll become the ninth rookie to appear in all 162 games and just the third in the past 30 years, joining 2003 Hideki Matsui and 2007 Delmon Young.
In September, Murakami and fellow countryman Kazuma Okamotojoined Stewart in the 30-homer club, making this the first season in MLB history to have three rookies clear the 30-homer threshold. Just 10 prior seasons featured two 30-homer showings from rookies. The 1964 season (Dick Allen with 29, Jim Ray Hart with 31, Tony Oliva with 32) and 2019 (Alonso with 53, Eloy Jiménez with 31, Christian Walker with 29) came close to having three, but this year, the accomplished Japanese duo of Murakami and Okamoto and the gregarious Miami native Stewart set a new bar.
And the homers tell only part of the story when it comes to rookies’ offensive impact. Rookies have combined to hit .243/.315/.390 across 23,729 plate appearances this season (that’s roughly 13% of the total plate appearances league-wide.) And park and era-adjusted metrics tell an even more impressive story: That slash line equates to a 96 wRC+, which would be the highest mark ever recorded by a rookie class, besting the 94 wRC+ posted in 2015. For context, last year’s class recorded an 86 wRC+, and from 1996 to 2004, the high-water mark was 82.
In other words, this is the closest a rookie class has ever come to collectively producing like league-average hitters (100 wRC+), which is quite the accomplishment for a subset of players who have historically struggled in their first go at big-league arms. The most significant contributors among first-year bats who recorded at least 400 plate appearances: DeLauter (132 wRC+), Giants first baseman Bryce Eldridge (131 wRC+ and an ultimate grand slam along the way), McGonigle (130), Murakami (128), White Sox outfielder Tristan Peters (123) and Rockies first baseman TJ Rumfield (121). There’s no doubt: These rookies came ready to rake.
Stars on the mound
While the plethora of impact bats largely defined this year’s standout class, several rookie arms emerged as difference-makers as well. Two in particular — New York Mets right-hander Nolan McLean and Cleveland Guardians lefty Parker Messick — separated themselves as the premier rookie hurlers in their respective leagues.
That we are discussing these two as part of this rookie review is already interesting, considering how close they came to exhausting their eligibility last year. They debuted within a week of each other in August 2025 and took several turns through the rotation but stayed below the 50-inning threshold to maintain their rookie eligibility for 2026; Messick logged 39 ⅔ frames and McLean 48.
While both pitchers thrived down the stretch last season — Messick’s ERA was 2.72 across seven starts, McLean’s 2.06 across eight — McLean came into this season with substantially more hype. He was a surefire member of the Mets’ rotation from the moment he arrived in spring training, and most prospect outlets tabbed him as the top pitching prospect in the sport. Messick, meanwhile, appeared on the back half of top-100 prospect lists and did not come to camp with a spot on Cleveland’s starting staff secured.
But Messick made his case clear in March and nabbed the fifth starter spot in the final days of camp. Since then, he has emerged as the Guardians’ unquestioned ace. Not only has Messick made a serious push at surpassing presumptive favorite McGonigle in the AL Rookie of the Year race, but he’s also squarely in the mix to be an AL Cy Young finalist behind expected top finishers Cam Schlittler and Dylan Cease. Among qualified AL starters, Messick ranks third in ERA (2.55), third in WHIP (1.04), third in innings pitched (183 ⅓) and fourth in fWAR (4.8). A strong showing in the postseason could further cement his season as one of the best by a rookie pitcher in recent memory.
In New York, meanwhile, McLean has lived up to the lofty expectations, a welcome silver lining in an otherwise disappointing Mets season. In his final outing of the year on Wednesday, McLean tossed seven innings of two-run ball against the Rangers, marking his 20th quality start of the season; only Yoshinobu Yamamoto, Sandy Alcantara and Cristopher Sánchez have more. Opponents have hit just .211 against McLean this season, the third-lowest among qualified NL starters behind Yamamoto and Jacob Misiorowski. A more crowded National League field makes an appearance on the Cy Young podium unlikely for McLean, but he represents a compelling alternative for NL Rookie of the Year voters who might not be sold on Sal Stewart’s gaudy traditional counting stats.
Rookies to watch in the postseason
If there’s one downside of this year’s rookie class, it’s that many of the best performers will not be playing in October: McGonigle, McLean, Stewart, Wetherholt, Benge, Okamoto and Royals catcher Carter Jensen, among others. But that doesn’t mean there won’t be rookies worth watching in the postseason, and next month will present an awesome opportunity for some of this year’s young players to elevate their profiles.
Here’s an overview of the rookies to watch on each postseason team:
Brewers
Just as they did last year with Jacob Misiorowski, Chad Patrick, Caleb Durbin and Isaac Collins, the Brewers have once again leaned on a deep group of rookies en route to the top of the standings. Right-hander Logan Henderson has emerged as a stellar No. 2 behind Misiorowski, and lefties Shane Drohan and Robert Gasser should factor into Milwaukee’s postseason pitching plans as well. Shortstop Cooper Pratt and outfielder Luis Lara both signed long-term extensions before making their debuts and have become valuable down-lineup contributors, with their gloves their standout trait so far.
Dodgers
Might we see 21-year-old Josue De Paulaon the Dodgers’ postseason roster, even if Shohei Ohtani is back in the lineup as the starting DH? De Paula sure looked the part in the batter’s box in his small sample of September games, so it might be worth keeping his special left-handed bat available, if even in a bench role. It doesn’t seem like an accident that the Dodgers’ decision to option De Paula this week upon Ohtani’s return preserves the chance for him to return in time for the division series.
Braves
Having turned only 21 in June, righty Didier Fuentes is the youngest pitcher in the majors, and he has also been one of the most valuable relievers in the majors. He’s a not-so-secret weapon on Atlanta’s relatively thin pitching staff.
Cubs
Switch-hitter Pedro Ramírez, at just 22,has been perfectly cromulent on both sides of the ball for Chicago, producing 100 wRC+ in 250 plate appearances and covering multiple infield spots when Cubs starters have gone down due to injury.
Padres
It’s unclear whether top prospect and youngest big leaguer Ethan Salas will get any real playing time behind the dish in the playoffs, but the Padres do have a rookie pitcher who could seize some attention: 22-year-old right-hander Bradgley Rodriguez has been exceptional coming out of San Diego’s elite bullpen, thanks in large part to a diabolical changeup that he throws 43% of the time.
Phillies
While they haven’t been statistical standouts in the regular season, right-hander Andrew Painter and center fielder Justin Crawford could still play pivotal supporting roles for Philadelphia in the postseason, depending on the matchup. Painter might need to cover some important innings, especially given the fragile state of the Phillies bullpen and Jesus Luzardo’s recent injury.
Rays
Acquired from Miami in a minor trade back in February, Victor Mesa Jr. has emerged as a surprising power source as the Rays’ regular right fielder (14 HR, .500 SLG% in 74 games). Right-hander Brody Hopkins debuted recently and has long had erratic control, but he has some of the nastiest stuff on the planet, so prepare to see him all over @PitchingNinja’s feed this postseason.
Guardians
If Messick and DeLauter haven’t provided enough rookie impact for one roster, Cleveland also has a former No. 1 overall pick in Travis Bazzana, who has given the lineup a real boost as the every-day second baseman. And it’s hard to remember because of his winding career path, but 31-year-old lefty Foster Griffin is technically rookie-eligible this season. He was an All-Star before being traded to the Guardians from the Nationals at the deadline.
Astros
The debut season of Japanese right-hander Tatsuya Imai might have been a flop, but a different righty has been an invaluable, multi-inning resource for an injury-ravaged Houston pitching staff. AJ Blubaugh leads not only rookie relievers in innings pitched by a huge margin but also relievers in general, with a whopping 95 ⅓ frames completed across 63 appearances.
Yankees
If Aaron Judge is compromised (or flat-out unavailable) in the postseason, the Yankees will need several others in the lineup to step up, and New York has two rookies who could provide a spark in athletic shortstop George Lombard Jr. and outfielder Spencer Jones. Jones has hit .290/.342/.514 with six homers over his past 31 games; we’ll see if his severe strikeout rate (36%) undermines his viability in October. The 21-year-old Lombard will be the second-youngest hitter on a postseason roster behind Salas (or the youngest if Salas is left off).
Red Sox
Boston’s rookie representation is uniquely lopsided. Led by terrific lefty Payton Tolle, two more southpaws in Jake Bennett and the since-traded Connelly Early, and a pu pu platter of relievers, the Red Sox lead MLB in innings pitched by rookies with 513 ⅔, just ahead of the Brewers. But they rank 30th in plate appearances taken by rookies at just 44, all by utilityman Tsung-Che Cheng.
White Sox
A staggering 35% of Chicago’s plate appearances have been taken by rookies, by far the highest portion in the league. The White Sox have benefitted from the contributions of the aforementioned Murakami, Montgomery and Peters, as well as Sam Antonacci, whose unique skill as a hit-by-pitch magnet (28 plunkings!) helps fuel his high-OBP profile. Only Rumfield (.386) and McGonigle (.378) have reached base at a higher clip than Antonacci (.364) among qualified rookies. And on the mound, lefty Hagen Smith has been a dynamite bullpen weapon.
Rangers
Undrafted and plucked out of an independent league a few years ago, Peyton Gray has been a rock-solid reliever for Texas since he debuted in April at age 30. But that’s about it here; the Rangers rank 29th in rookie plate appearances (65), ahead of only the Red Sox.
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