The 2026 MLB season is the first to allow players to challenge umpires' calls on balls and strikes.

Explore the data behind every Major League Baseball player's success rate with ABS, its new tech-assisted challenge system.

Inside MLB's robo-umping experiment

Human umpires call roughly 94% of pitches right overall, but performance reduces on borderline pitches in high-leverage moments, the calls that shape game outcomes most. A professor and historian analyze early experiments with the full "robot ump" system that helped shape MLB's decision to implement a compromise "challenge" system.

MLB 2023 rules changes were the most dramatic alterations in decades, drastically speeding up the game.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

Major League Baseball, explained

Major League Baseball is America’s oldest professional sports league. Alongside triumphs, the league has faced scandals, including drug abuse and steroid use, shaping its path over the decades. Today, MLB embraces new rules, international talent, and a growing connection to legalized sports betting.

Before 1920, during the Deadball Era, a single baseball was used throughout a Major League game, leading to a notoriously dirty style of play.

Statcast, MLB's sophisticated real-time data analytics system, runs machine learning models in the 23-second gap between every pitch.

MLB pitchers were charged with benefiting from sports betting

In November 2025, two pitchers for the Cleveland Guardians were charged with coordinating with sports bettors to enrich themselves and others. In many instances, they shared the kinds of pitches they would throw at specific points in the game. Bettors then placed money on those actions.

The first MLB All-Star Game was designed by a sports journalist who believed the spectacle would boost baseball's reputation during the Great Depression.

In 1975, a Major League Baseball clause that kept players legally tied to their teams after retirement was dismantled, creating the modern concept of free agency.

Every baseball used by the MLB only lasts about 7 pitches before it's discarded.

A history of the rare, chaotic moments when MLB batters charge the pitcher on the mound

They typically occur when a pitcher has slung a pitch a little too close to the batter—though the exact causes vary, from quick tempers to longstanding grudges. No definitive account of these infrequent but highly visible incidents has existed, so sportswriter Jon Bois compiled data on 264 such moments between 1950 and 2025. The resulting 23-minute video explores the rich narratives leading to these charged events.

Every MLB baseball needs to be rubbed with a special kind of mud, provided by one New Jersey family.

Sabermetrics, the empirical analysis of baseball statistics made famous by 'Moneyball,' redefined how people evaluate baseball players, overturning a century of assumptions about which metrics matter most.

The MLB consist of 30 teams

The league is home to the National and American leagues, which include 780 active players. The MLB season is the longest in professional sports, with 162 games played during the regular season, typically from April through September, ending with the World Series championship in October.

Visualize how changes to lineups, driven by modern analytics, could have changed one of MLB's most iconic moments.

How Shohei Ohtani made baseball fun again

To rise to the level of Major League Baseball in recent decades, a player needs to become a specialist in at least one of the sport's many skills: hitting, pitching, throwing, running, fielding. For decades, this specialization has made a so-called...

A sophisticated data analysis found that stadiums with roofs or in cities that regularly have sunny skies are the easiest for outfielders to play in.

The MLB's reserve clause gave owners rights to players after their contracts expired

The clause was added to contracts in 1879, allowing owners to hang on to players after the expiration of their contracts, sometimes in perpetuity.

Sports leagues have attempted to prevent athletes from betting

As pro and collegiate sports embrace betting (and the revenue that comes with it), each league works diligently to ensure the integrity of the games by hiring private firms to analyze irregular bets. These companies have flagged bets that led to the firing of Alabama’s baseball coach, the suspension of multiple athletes at Iowa and Iowa State, and, most recently, a lifetime ban on former Toronto Raptors forward Jontay Porter by the NBA in April 2024.

The 1919 Chicago White Sox, later known as the 'Black Sox,' were banned from baseball for fixing that year's World Series despite being acquitted in court.

Sidearm pitchers—who throw the ball at an odd angle, sometimes very close to the ground—are a rarity in modern baseball, which often makes them more difficult for batters to hit.

Fantasy sports' roots go back to an 1860s parlor game that simulated real-world baseball.

Fourteen ways to make baseball cool again

Baseball, while commonly known as America's pastime, gets a bit of a bad rap for being long, slow, and boring. Here are fourteen fun ideas to make the sport more interesting to combat dwindling attendance.

A Bay Area lab was supplying MLB players with steroids

The Bay Area Laboratory Co-operative, also known as BALCO, began as a modest vitamin shop, but by the 1990s it was at the center of a doping scheme that rocked Major League Baseball and other professional sports.

How baseball shaped Black America during Reconstruction

A cornerstone of the budding Black culture following the Civil War was baseball, with several clubs springing up in Black neighborhoods and leaders like Frederick Douglass cheering on the players, including his son, who played for a team in Washington. This detailed history of the early Black leagues unpacks how the game enhanced the upwardly mobile community—and why that fact led to the segregation of what would become Major League Baseball.

Integration of Latino players in MLB

The Senators’ spectacular losing record obscures one of the most important stories in baseball history: the club’s role in integrating Latino players into the major leagues

Some say baseball's drug problem goes back to the late 1800s

At age 32, pitcher James “Pud” Galvin was feeling tired and decided to take "the Brown-Séquard elixir," which contained a testicular fluid from dogs and guinea pigs, believed to invigorate tired bodies. It might've worked: Galvin pitched a two-hit shutout the next day.

Designing the pitches for the FIFA World Cup 2026 took turfgrass scientists about eight years, as they sought to create identical conditions for indoor and outdoor fields across North America at various altitudes and climates.

Minor leaguers once unionized for better pay, housing, and medical care

For decades, Minor League baseball players endured overcrowded housing, indifferent medical care, and all-night bus rides for a chance to make it to “The Show.” And they did it for as little as $4,800 a year.

100 moments that shaped baseball history

Published in 2018 by baseball historian Jacob Kornhauser, this list examines the defining moments throughout more than a century of play on the field, from Pittsburgh Pirates pitcher Dock Ellis purportedly throwing a no-hitter while on acid to Jackie Robinson breaking the color barrier.

Henry Chadwick invented the box score in 1859—and wrote off walks as a pitcher's failure

A 1930s card game birthed modern fantasy sports

"National Pastime" used the statistics of real Major League Baseball players to determine a winner, creating the template for the modern fantasy sports model.

NFL kickers are kicking the ball farther than ever before

A combination of training, technique, and new rules regarding equipment has led to a sharp improvement in kicking since 2020. Certain players are now allowed to keep footballs with them throughout the practice week and play with a ball of their choosing during games.

The gray area that makes PEDs seem like leveling up to hardcore athletes

Doping in sports is broadly condemned as unsafe and unfair. Significant controversies in major sports, including baseball and cycling, have been prompted by the widespread use of performance-enhancing drugs, which are described as clear-cut dangers and abuses of the rules. But to many competitors, the line between a PED and the next smart technique to adopt is unclear. This podcast episode explores that gray reality.

The evolution of the baseball bat

Torpedo bats may be the latest, most powerful kind of baseball bat, but the instrument's history is long. This Smithsonian resource traces the bat's evolution from handmade objects forged by the players to mass-produced marvels of physics designed by companies like Louisville Slugger. Along the way, you'll see some interesting takes on the form, including bats referred to as "mushrooms" and "bananas."

A visual guide to identifying baseball's pitches, from common pitches like 'fastball' and the 'change up' to specialty types, like 'cutter' and 'slurve.'

Some athletes warm up with equipment from other sports

Baseball superstar Shohei Ohtani uses a cricket bat; his teammate Yoshinobu Yamamoto throws a javelin. Quarterback CJ Stroud shoots free throws. The reasons are partially physical (it's good to exercise different parts of your body) and partially mental (it's nice to take the pressure off with someone else's game).

The 2011 film 'Moneyball' shifted ideas about sports and statistics

Based on the Michael Lewis book of the same name, the film starring Brad Pitt depicts the attempts of the 2002 Oakland A's to leverage data analysis to overcome their low-budget woes ($41M) and compete with big-budget teams like the New York Yankees ($125M). Other sports and leagues, including the NBA and NFL, would adopt a similar logic: find what the market undervalues and exploit it.

X Games League to debut team-based format in 2026

Beginning in 2026, the X Games League will feature four city-based franchises with male and female athletes competing in skateboarding, BMX, and motocross—introducing season-long team competition to the event’s structure.

A 2024 cheating scandal cast doubt on the industry

In 2024, National Fantasy Football Championship, a fantasy league with big payouts, fired one of its employees for manipulating data. The episode cast doubt on the relatively unregulated industry, despite the league coming down hard on the nefarious worker.

Ballpark nachos—the messy but delicious combo of liquid cheese, pickled jalapenos, and tortilla chips—were invented for the Texas Rangers.

Each July 1, six-time Major League Baseball All-Star Bobby Bonilla gets $1.19M from the New York Mets, thanks to a 25-year-long deferred payment agreement.

Explore some of the best baseball books, including Michael Lewis' influential 'Moneyball' and Bob Uecker's autobiography 'Catcher in the Wry.'

In 2001, Little League World Series pitcher Danny Almonte was a widely praised superstar until it was revealed he was 2 years older than his competitors.

Pickleball's popularity has created a power struggle

The sport's sudden rise has led to a tumultuous landscape with battles over governance, court space, and player rights. This Sports Illustrated deep dive examines the competing billionaires vying for control, the conflicts over court usage and noise disputes, and how a second proposed Hall of Fame is dividing the sport.

The biggest controversies of the NFL

Some of the biggest controversies in NFL history didn’t just spark debate—they changed the game. From Spygate and Deflategate to concussion research and the league's ambivalent stance on it, these moments led to new rules, safety measures, and major policy shifts. Explore how each scandal shaped the league and its future.

In 2025, the 'two strikes and you're out' rule took effect to protect consumers from repeated attempts to withdraw money

After years of being delayed by litigation, a 2024 US Supreme Court ruling upheld a law that prevents lenders from attempting to take payments from accounts with insufficient funds more than twice without reauthorization. This tactic is commonly used by payday loan companies, which technically require repayment on the day borrowers receive their paychecks.

Ken Caminiti exposed steroid use around the league

In 2002, newly retired Ken Caminiti was the first to admit to using steroids as a player, citing how common PEDs were in the league, something that had long been rumored, especially after the single-season home run record was broken in 1998 by Mark McGwire.

Tim Donaghy and the NBA game fixing scandal

A two-year investigation by ESPN details how former NBA referee Tim Donaghy conspired to fix games, who he was working with, and where the money was going. In a lengthy statement, the NBA denied much of the new claims in the article, saying the data ESPN used was not strong and they were unable to replicate it. Donaghy was given a lifetime ban and served nearly all of his 15-month sentence.