The 2026 MLB season didn’t just open — it announced itself. From the very first pitch at Oracle Park on a Wednesday night in San Francisco, this season made clear that change is here. Robot umpires. A generational rookie class arriving all at once. The two-time champion Los Angeles Dodgers already looking dangerous. The New York Yankees pitching staff operating like a well-oiled machine. And the Miami Marlins, of all teams, sitting near the top of the National League.
One week in, the 2026 season has already given us enough to talk about for months. Here’s everything you need to know.
The Biggest Story: The ABS Challenge System Is a Hit
There’s no bigger storyline from Week One than the debut of MLB’s Automated Ball-Strike (ABS) Challenge System — and the early verdict is overwhelmingly positive.
How It Works
MLB’s ABS system keeps a human umpire behind the plate but gives teams a high-tech recourse when they believe a call was wrong. Each team begins the game with two challenges. Batters, pitchers, and catchers — but not managers — can initiate a challenge by tapping their helmet or cap immediately after a pitch. The pitch is then reviewed in near-real time using Hawk-Eye tracking technology, and the result is displayed publicly on the stadium videoboard.
If a challenge succeeds, the team keeps it. Lose two challenges, and you’re done for the game. In extra innings, teams that have exhausted their challenges receive one additional challenge per inning.
The strike zone itself is precisely defined: the top sits at 53.5% of a player’s measured height (without cleats), the bottom at 27%, and pitch location is captured as the ball passes above the middle of the plate, not the front edge.
The First Challenges in History
History was made on Opening Night. Yankees shortstop José Caballero stepped up in the fourth inning at Oracle Park and became the first player in MLB history to issue an ABS challenge in a regular-season game — disputing a called strike from Logan Webb. The call was upheld, making Caballero 0-for-1 in the history books.
The following day brought the first successful challenge. Mets catcher Francisco Álvarez challenged a ball call on a Freddy Peralta pitch, which was overturned to a strike — resulting in a strikeout of Pirates slugger Oneil Cruz. That’s a catcher working the system perfectly on Day 1.
Early Stats and Trends
The opening weekend and first full week produced a wealth of ABS data:
- In the season’s first 48 games, there were 175 total challenges and 94 overturned calls — a 54% success rate overall.
- Spring training data showed challenges succeeded at a 53% clip across 1,844 attempts, with defense (pitchers/catchers) winning at a 60% rate compared to just 45% for hitters.
- The average in spring was 4.32 challenges per game, with 2.28 of those resulting in overturns.
Salvador Perez of the Kansas City Royals emerged as perhaps the early ABS MVP among catchers, going 4-for-4 on challenges in the opening weekend — all of them on low fastballs that barely grazed the bottom of the zone.
Mike Trout was the standout among hitters. Over the first five days, the Angels outfielder issued four challenges and won three of them. Given his career-long mastery of the strike zone, Trout may end up being one of the biggest individual beneficiaries of the ABS era.
The Minnesota Twins issued the most team challenges in the opening series, calling for 11 in three games, going 4-for-6 as hitters and 3-for-5 on defense.
Who’s Winning and Who’s Struggling
Team-level challenge efficiency varied wildly in Week One:
- The Baltimore Orioles led the majors with an 86% overturn rate on 7 challenges — the most clinical approach in baseball so far.
- The New York Yankees won 8 of 11 challenges (73%), reinforcing their analytical edge.
- The Cincinnati Reds were also sharp at 73%, with catchers and hitters appearing to be well-coordinated.
- On the other end, the Cleveland Guardians lost 6 of 7 challenges, and the New York Mets were 0-for-2.
The Big Strategic Question
One of the most interesting early debates is when to use challenges. Broadcast analysts were heard advising teams to “save your challenges for when you need them late in games” — but is that actually the right strategy? As ESPN noted, most games are decided in the early and middle innings, not in high-leverage closing situations against elite relievers. The Twins’ aggressive approach may prove to be more analytically sound than hoarding challenges for the ninth.
One thing is already clear: catchers are more valuable than ever, and teams that coached their players up on zone awareness this spring look sharper out of the gate. As ESPN’s Jeff Passan wrote after the opening weekend: “Not only does ABS work, it makes the game better.”
Team Storylines: Hot Starts and Early Concerns
New York Yankees (5-1): Built for October, Running in April
The Yankees are off to the best start in the American League, and they’re doing it without two of their best pitchers. Carlos Rodón and Gerrit Cole are both rehabbing from arm surgery and aren’t expected back until summer — yet New York’s staff posted a 1.01 ERA through six games, allowing just three runs in the first four games of the season.
The story starts with Max Fried, who cruised through 6⅓ scoreless innings on Opening Night and followed that with seven more scoreless frames in his second start — making him the seventh pitcher in Yankees history to open a season with back-to-back scoreless outings of at least six innings.
Rookie Cam Schlittler has been just as dominant. He allowed one hit over 5⅓ innings with eight strikeouts in one outing and finished a week road trip to Seattle with more than 34% of his pitches generating either a called strike or a swing-and-miss. His entire arsenal consists of fastball variants (four-seamers, cutters, two-seamers) that he tunnels so effectively that hitters can’t differentiate them until it’s too late — an unusual approach in 2026, but one that clearly works.
The Yankees also swept the Giants in the season’s opening series, allowing just one run in three games.
Los Angeles Dodgers (5-1): Three Japanese Starters, Zero Slowing Down
The two-time defending World Series champions jumped out to a 5-1 start and, in doing so, made baseball history. The Dodgers became the first team in MLB history to start a Japanese-born pitcher in three consecutive games, rolling out Roki Sasaki on Monday, Shohei Ohtani on Tuesday, and Yoshinobu Yamamoto on Wednesday.
Ohtani’s return to the mound was the marquee moment. In his first pitching start of 2026, he extended his scoreless innings streak to 22⅔ frames dating back to the previous regular season — the longest active scoreless stretch among MLB starters. He also pushed his on-base streak to a career-high 37 consecutive games, the longest active on-base run in baseball.
Sasaki, who struggled badly in spring training (allowing 26 of 52 batters he faced to reach base), looked much more like himself in his regular-season debut, pitching into the fifth inning and surrendering just one run. It wasn’t dominant, but it was a meaningful building block.
Miami Marlins: Baseball’s Early NL Surprise
Nobody put the Marlins at the top of the National League in their preseason projections — but here they are. Miami jumped out to a 5-1 record through the first week, tied with the Milwaukee Brewers for the best mark in the NL.
Sandy Alcantara’s complete game performance anchored the club on multiple occasions, and the Marlins were clinical in close games, including a walk-off victory over the Rockies.
Milwaukee Brewers (5-1): Dominant Despite Early Injury News
The Brewers matched Miami at 5-1 despite a rough start to Opening Day. The team received the unexpected news before first pitch that outfielder Jackson Chourio had landed on the injured list — but it barely mattered on the field.
Rookie starter Jacob Misiorowski set a franchise record with 11 strikeouts on Opening Day without issuing a walk, and he followed that with a solid second start (7 K’s over 6 innings). The Brewers’ pitching depth looks elite, and when their lineup gets fully healthy, they could run away with the NL Central.
Pittsburgh Pirates: Redemption Arc for Skenes?
Paul Skenes, the reigning NL Cy Young Award runner-up, had the worst start of his young career on Opening Day — he didn’t make it out of the first inning. But he bounced back convincingly in his second start, striking out five over five innings in an 8-3 win over the Reds, with Oneil Cruz providing early fireworks via a three-run home run.
Cruz, in fact, launched three home runs in two games in the early going — a reminder that Pittsburgh’s lineup has real power when the pieces are healthy.
Atlanta Braves: The Expected Powerhouse Hits Its Stride
The Braves showed their ceiling in a blowout 17-2 victory over the Arizona Diamondbacks, with Matt Olson leading the way with a first-inning solo shot. Every starter in the lineup recorded at least one hit, and the Braves are quietly building toward what many expected to be a deep playoff run.
Meanwhile, Olson quietly reached 789 consecutive games played entering the week — the 12th-longest streak in MLB history.
Chris Sale also looked sharp in his first start of the season, mixing velocity that touched 98.3 mph with command and benefiting from excellent defense, while the Royals’ Cole Ragans wavered and gave up three home runs on three different pitches.
Concerns: Oakland Athletics and Kansas City Royals
The Oakland A’s had a rough introduction to 2026. Through their first four games — all losses — they slashed just .170/.222/.289, scored 11 runs total, and struck out a staggering 57 times. Manager Mark Kotsay remained calm, and it’s an impossibly small sample, but the offensive projection that had some believing the A’s could contend in the AL West didn’t show up early.
The Kansas City Royals’ bullpen was another area of concern from the opening week. Multiple analysts flagged early reliever issues that will need to be addressed if Kansas City wants to remain in the AL Central picture.
The Rookies Are Stealing the Show
Perhaps no aspect of the 2026 season has generated more excitement than the rookie class. The early returns suggest it could be one of the most impactful first weeks from a group of first-year players in recent memory.
Chase DeLauter, OF — Cleveland Guardians
DeLauter entered the 2026 season as one of baseball’s top prospects, and he’s delivered immediately. He homered in each of his first three major league games — two in the opener in Seattle, one in game two, and another in game three — making him just the third or fourth rookie in MLB history to accomplish that feat (alongside White Sox outfielder Munetaka Murakami, who did the same thing simultaneously). By early April, DeLauter’s four home runs were more than 12 entire teams had hit. The Progressive Field crowd has embraced him fully, singing along to his walk-up song, John Denver’s “Take Me Home, Country Roads,” from the first inning on.
Munetaka Murakami, OF — Chicago White Sox
The Japanese star made the jump to MLB and immediately made history. Like DeLauter, Murakami homered in each of his first three major league games, joining DeLauter as just the third and fourth rookies ever to accomplish the feat. His presence gives the historically struggling White Sox an electric offensive weapon and a genuine reason for their fanbase to tune in.
Kevin McGonigle, SS/3B — Detroit Tigers
McGonigle, 21, had four hits in the Tigers’ Opening Day game in San Diego, becoming the third-youngest player with four or more hits on Opening Day in the last 100 major league seasons. He followed that up by battling through a high-leverage at-bat against veteran lefty Wandy Peralta with the bases loaded, eventually fouling off a pitch Peralta thought would finish him, and continuing to compete. Manager A.J. Hinch called him “locked in.” He’s equally comfortable at shortstop and third base and looks like the franchise piece Detroit has been waiting for.
JJ Wetherholt, INF — St. Louis Cardinals
Wetherholt already earned a curtain call and a walk-off hit in the first week of his MLB career. That’s the kind of arrival that gets a fanbase emotionally invested in a player for years to come.
Carson Benge, OF — New York Mets
Benge arrived at the big-league level having played just a handful of games above Double-A, but he showed zero signs of being overmatched. He drew two walks, stole a base, and hit his first career home run (385 feet to right field) in his fourth career at-bat. Mets manager Carlos Mendoza highlighted his composure: nothing seemed to speed him up, and he read the game with the instincts of a player far more experienced.
Sal Stewart, 3B — Cincinnati Reds
Stewart’s opening series was almost absurd. He posted a .769 on-base percentage through the first weekend — a number that’s unsustainable, of course, but it speaks to an elite approach at the plate from a player expected to be a cornerstone of the Reds’ future.
Notable Individual Performances
Joey Wiemer (team TBD) reached base safely in each of his first 10 plate appearances to start the season, tying Carlos Delgado (2002) for the longest streak to start a year in at least the live-ball era and setting a record for the start of a player’s tenure with a team.
Kevin Gausman struck out at least 10 batters without issuing a walk in each of his first two starts — the first pitcher since at least 1900 to accomplish that. His second start produced another 10 strikeouts with zero walks, building on his 11-K, 0-BB Opening Day gem.
Jose Fernandez hit two home runs in his MLB debut, including the go-ahead shot in the eighth inning — becoming just the eighth player in MLB history to go deep twice in their first career game.
Shea Langeliers hit five home runs in the A’s first six games, tying both Mark McGwire’s A’s franchise record and a historical catching record tied to Gabby Hartnett (1925).
Jacob Misiorowski set a Brewers Opening Day record with 11 strikeouts and no walks — a dominant debut for one of Milwaukee’s most prized young arms.
Week One Standings Snapshot
After the first full week of play, the early standings showed a clear picture of who’s rolling and who has work to do:
AL East: The Yankees (5-1) and Blue Jays (5-1) jumped out early, with Toronto beginning its defense of the AL pennant in strong fashion.
AL Central: Detroit led the way at 2-1 in early games, with Cleveland lurking despite ABS challenge struggles.
AL West: Texas opened 2-1, with Seattle and Houston bunched together.
NL East: Miami’s surprising 5-1 start was the headline, with Atlanta, the Mets, and Washington all sitting at 2-1.
NL Central: Milwaukee (5-1) was the class of the division, with Cincinnati and St. Louis both at 2-1.
NL West: Los Angeles (5-1) is the clear frontrunner, with Arizona and Colorado both opening 0-3.
What to Watch in Week Two
Can the Marlins sustain it? Miami is built on pitching and defense, and while those traits can win games in April, the rest of the NL East will get sharper. Enjoy the hot start, but let’s see how they look in three weeks.
Shohei Ohtani’s scoreless streak. Standing at 22⅔ innings entering the season, the streak is already one of the longest of Ohtani’s career. Every start is appointment viewing.
ABS strategy evolution. Teams are still figuring out when to deploy their challenges. The Twins’ aggressive approach versus the Orioles’ conservative precision will be fascinating to compare over the long haul.
Skenes’ bounce-back. If the Pirates ace can string together two or three quality starts after that ugly Opening Day, the narrative shifts entirely. Pittsburgh has legitimate playoff aspirations, and they need Skenes to be Skenes.
The A’s offense. Fifty-seven strikeouts in four games is alarming even in a small sample. Something needs to click offensively for Oakland to be relevant.
Final Thoughts
Week One of the 2026 MLB season delivered everything baseball fans could have asked for. A historic rookie class arrived swinging. The ABS Challenge System generated instant drama, meaningful strategic conversation, and — critically — cleaner calls in the moments that matter most. The Yankees and Dodgers look like exactly what their offseason construction suggested they’d be. And there are already a handful of teams (Miami, Milwaukee, Pittsburgh) giving fans something unexpected to latch onto.
The ABS system in particular feels like it’s here to stay. With 94 overturned calls in the first 48 games, the technology is catching real mistakes in real time, and the drama of a challenge in a two-strike, full-count situation is something entirely new for baseball. Whether teams learn to use their challenges wisely — or waste them chasing lost causes — will be one of the sport’s most interesting new strategic dimensions throughout the summer.
Baseball is back. And it’s already really, really good.
Follow baseballresource.org for ongoing 2026 MLB season coverage, including weekly recaps, standings analysis, rookie tracking, and in-depth ABS challenge data throughout the year.
