Know The Rules: World Baseball Classic Cheat Sheet

The World Baseball Classic is here and if you have not been following along closely enough to know exactly how the tournament works, here is your quick guide to the rules before things get started in earnest.

• Complete Schedule: 2026 World Baseball Classic

• World Baseball Classic: Full Pool Breakdown, What to Watch, and Predictions

Twenty teams are in the field this year, same as 2023. Sixteen of them qualified by finishing in the top four of their respective pools three years ago. Colombia, Nicaragua, Brazil, and Chinese Taipei punched their tickets through qualifying rounds.

World Baseball Classic Rulebook:

The rules largely follow MLB’s current setup with a few tournament-specific wrinkles worth knowing about.

There is a designated hitter, just like MLB. Defensive shifts are permitted, which is bad news for pull-heavy lineups.

For the first time in WBC history there will be a pitch clock, following the same MLB rules: 15 seconds to throw with the bases empty, 18 seconds with runners on, and batters must be ready by the eight-second mark.

The Automatic Ball-Strike System will not be used, so human umpires are calling balls and strikes throughout the tournament.

Extra innings work differently than a standard regular season game.

Any tie game that reaches the tenth inning triggers the ghost runner rule, with a runner placed on second base to start each half-inning. That runner is whoever made the last out in the previous inning.

The mercy rule is in effect during the first round and quarterfinals. A team leading by 15 or more after five innings or 10 or more after seven innings ends the game early.

Pitch counts are the most important rule to understand when thinking about how managers will deploy their rotations. Pitchers are limited to 65 pitches per game in the first round, 80 in the quarterfinals, and 95 in the semifinals and final.

A pitcher can exceed his limit to finish an active at-bat. If a pitcher throws 50 or more pitches he needs at least four days before his next appearance.

Thirty or more pitches requires one day of rest. Pitching on consecutive days also requires at least one day off afterward.

The three-batter minimum is in place, meaning a pitcher must face at least three batters or record the final out of an inning before being pulled, barring injury.

On replay, managers get one challenge per game and keep it if the challenge is successful. In the semifinals and final each team gets two challenges.

Tiebreakers in pool play go to head-to-head record first, then to a runs-allowed quotient, then earned runs allowed, then batting average in head-to-head games, and finally a drawing of lots if everything else is still deadlocked.

The 2023 World Baseball Classic final was Japan over the United States 3-2, with Shohei Ohtani closing out the game by striking out Mike Trout. Team USA is loaded this time around and the rematch potential is very much alive.

Now you know the rules. Let’s play ball.

Join The Chase