There are the rookies who get their feet wet in one season and then have a fuller Major League experience the next, with their rookie status still technically intact. And then there are the rookies whose debut year is, in fact, their actual rookie year.

This piece is about the latter.

Only half of the Rookies of the Year this decade have been players whose rookie year was their actual debut year. It’s a difficult thing to succeed in that first exposure to the big leagues, so we’re going to salute the members of this year’s deep rookie class who arrived this season and did exactly that.

This is the 2026 All-Debut Team! (All stats are through Wednesday’s games.)

C: Joe Mack, Marlins
Debut: May 4
Mack got an early-season opportunity when Agustín Ramírez required a Minor League reset, and the 23-year-old has run with it. He has room to grow offensively (.682 OPS), but he’s shown flashes of above-average power for his position.

And it’s what he does behind the plate that matters most: Mack ranks in the 97th percentile in Fielding Run Value. He’s thrown out 24 would-be basestealers, which ranks second among all MLB catchers.

1B: TJ Rumfield, Rockies
Debut: March 27
While Munetaka Murakami of the White Sox also belongs here, we can save his pure power for our DH slot and go with the slicker defender at first.

Rumfield has made his presence felt offensively (.300/.392/.455 slash, including an .802 OPS away from Coors Field) and defensively (5 Outs Above Average). He’s an important building block for the rebuilding Rox.

2B: JJ Wetherholt, Cardinals
Debut: March 26
Two second basemen taken within the top seven picks in the 2024 Draft -- Wetherholt (No. 7) and the Guardians’ Travis Bazzana (No. 1) -- have had strong first showings in the bigs, with Bazzana even getting an All-Star nod. But before a wrist injury sidelined him just prior to September – he returned to action Wednesday -- Wetherholt was in strong position to win the NL Rookie of the Year Award.

He homered in his Opening Day debut, en route to a respectable .240/.341/.368 slash, 17 homers, 14 doubles and 14 steals. And he’s a defensive dynamo up the middle. His 22 Outs Above Average are tops at his position and third overall, behind only Cubs center fielder Pete Crow-Armstrong’s 26 and Royals shortstop Bobby Witt Jr.’s 23.

SS: Kevin McGonigle, Tigers
Debut: March 26
This isn’t just McGonigle’s debut season; it’s his age-21 season. He rapped four hits, including two doubles, in his Opening Day debut and has looked the part of a veteran big leaguer ever since. He’s been 24% better than league average offensively by OPS+ and shows great instincts on the bases.

Baseball-Reference has him at 6.7 WAR. How many rookies 21-and-under have had a WAR that high? Just Mike Trout in 2012 -- and Trout had debuted the year before. A tick behind McGonigle: Ted Williams (1939), Frank Robinson (1956) and Albert Pujols (2001). Not bad, huh?

3B: Kazuma Okamoto, Blue Jays
Debut: March 27
Big Oak’s had his ups and downs in coming over from Japan as a 30-year-old “rookie,” but a late-season tear is evidence that the six-time Nippon Professional Baseball All-Star is finding his way.

Okamoto’s 33rd homer set the obscure record for single-season blasts by a right-handed Japanese rookie. He’s been 10% better than league average.

LF: Sam Antonacci, White Sox
Debut: April 15
Though it didn’t translate into transcendent results in limited time in the tournament, people around Team Italy were raving about this kid’s bat-to-ball skills during the World Baseball Classic.

Then the Sox called him up, and he’s helped key their turnaround season by slashing .271/.367/.392 with 23 doubles and 18 steals. He’s still adjusting to the outfield after playing primarily in the dirt in the Minors, but there’s a lot to like here.

CF: Henry Bolte, A’s
Debut: May 13
In a nice crop of fresh-faced center fielders that includes the Mets’ A.J. Ewing and the recent impact debuts of the Blue Jays’ Brett Bateman and the Tigers’ Max Clark, Bolte gets our nod.

It’s pronounced BOL-tay, but “bolt” applies just as well for a guy with lightning-quick bat speed and sprint speed. He’s put forth a .275 average and .357 on-base percentage while swiping 20 bags, and his defense is an asset.

RF: Carson Benge, Mets
Debut: March 26
In another lost season for the Mets, at least we’ve been able to Benge-watch this kid. He’s provided excitement for the club’s future by slashing .270/.333/.413 with 18 homers, 19 doubles, three triples and 22 steals.

The former two-way player has a cannon for an arm, and his strike zone control, athleticism and baseball IQ make him an extraordinarily well-rounded player.

DH: Munetaka Murakami, White Sox
Debut: March 26
He has only DH’d a handful of times for the Sox, but he’s simply the best candidate for the spot on this list. The man who set the single-season home run record for a Japanese-born player in Nippon Professional Baseball had a surprisingly cool offseason market.

But he’s rewarded the supposedly rebuilding White Sox by helping to power them into quick contention with 31 homers and 14 doubles. The swing-and-miss is real, but so is the power and no telling of the story of 2026 is complete without him.

SP: Walbert Ureña, Angels
Debut: March 26
Before you ask, yes, this is the first Walbert in MLB history, which is probably historically significant enough to include him on this team. Ureña is also the only rookie pitcher to toss a complete game this year.

He did it amid posting a 2.88 ERA and 141 ERA+ (41% better than league average) with 131 strikeouts in 137 1/3 innings. He’s got control issues, but he’s a ground-ball machine and an important piece for an Angels team trying to dream things up again.

RP: Spencer Miles, Blue Jays
Debut: March 28
Viva the Rule 5 success story! Injuries limited Miles to 14 2/3 innings after the Giants drafted him in the fourth round in 2022. So he didn’t have a lot of -- ahem -- "Miles" on him. But he had good stuff, so the Jays took a shot on him in the Rule 5 Draft, rostered him out of Spring Training and watched him blossom into an effective ’pen weapon.

Through 91 2/3 innings, primarily in relief, he’s put up a 2.65 ERA, 1.09 WHIP and 3.6 strikeout-to-walk ratio. He’s got a deep mix that’s proven difficult to barrel up.