Baseball rules in five minutes
Rules baseline: Major League Baseball's 2026 Official Baseball Rules and current MLB competition procedures. NCAA, NFHS, Little League, international, and local baseball modify important details.
- Objective: score more runs by batting the ball and safely touching first, second, third, and home before the defence records enough outs.
- Players, field, and equipment: MLB uses nine players in the field on a diamond with 90-foot basepaths; bats, balls, gloves, helmets, bases, and uniforms must meet the applicable code.
- How play begins: the visiting team bats first, and each live-ball sequence begins when the pitcher legally delivers or otherwise puts the ball in play.
- Possession and turns: teams alternate offence and defence after three outs; batters hit in lineup order and runners may advance at their own risk unless a rule awards bases.
- Scoring: one run scores when a runner legally touches all four bases in order before the third out, subject to timing-play, force-out, appeal, and preceding-runner rules.
- Length and winner: an MLB game is normally nine innings; extra innings continue until one team leads after a completed inning, with current regular-season MLB runner procedures applying.
- Main violations: balks, interference, obstruction, illegal pitches, batting out of order, running-lane interference, and equipment or pace-of-play breaches create outs, bases, balls, strikes, or warnings.
- Restarts and penalties: play resumes with the ball made live after dead balls, substitutions, base awards, foul balls, and umpire time; some violations remain live until action ends.
- Competition differences: designated hitters, re-entry, pitch clocks, mound visits, mercy rules, base sizes, extra innings, replay, and pitching limits vary sharply by level.
- Go deeper: start with force plays, obstruction and interference, balks, appeals, and the full list below.
Browse Baseball rules by topic
25 plain-English explainers, grouped by the kind of decision you need to settle.
Essentials and setup
Players, playing areas, equipment, positions, and the basic structure of the sport.
Baseball Courtesy Runner and Pinch Runner Rules
MLB 2025 pinch-runner rules and Little League 2026 courtesy-runner variations: lineup effects, eligibility, timing, re-entry, and worked rulings.
Read explainerInfield Fly Rule
The MLB 2026 infield fly rule: every trigger, ordinary effort, fair-foul calls, runner choices, intentional drops, interference and worked rulings.
Read explainerMLB Hit by Pitch Rules Explained (2026)
MLB's 2026 hit-by-pitch rule: when the batter gets first base, strikes and no-award calls, dead-ball runner placement, replay, and the NCAA difference.
Read explainerMLB Mound Visits and Pitching Change Rules (2026)
MLB's 2026 mound-visit and pitching-change rules: four visits, ninth- and extra-inning allowances, forced removals, three-batter minimum, exceptions and worked cases.
Read explainerMLB Pitch Clock Rules 2026
MLB's 2026 pitch-timer rule explained: 15- and 18-second limits, the batter's 8-second deadline, timeouts, disengagements, balks, resets and exceptions.
Read explainerScoring and match formats
How points, goals, results, tied contests, and competition formats are decided.
Fouls, penalties, and conduct
Illegal contact, violations, cards, discipline, and how sanctions are applied.
Baseball Fair Territory and Foul Territory Rules
MLB's 2026 fair-and-foul rules explained: lines, bases, first touch, bounces, catches, foul poles, dead-ball outcomes and replay limits.
Read explainerBaseball Runner Interference Rules Explained
MLB's 2026 runner-interference rules: batted balls, protected fielders, thrown balls, the first-base lane, legal-base exceptions, slides and penalties.
Read explainerBaseball Umpire Interference Rules Explained
MLB's 2026 umpire interference rules: catcher throws, fair batted balls, dead-ball awards, live-ball exceptions, scoring and NCAA differences.
Read explainerCatcher Interference: MLB 2026 Rule
MLB's 2026 catcher-interference rule explained: first-base and runner awards, when the play stands, the manager's option, steals, squeezes and scoring.
Read explainerMLB Foul Ball and Foul Tip Rules Explained
MLB's 2026 foul-ball and foul-tip rules: dead or live ball, two-strike outcomes, caught fouls, bunts, runner movement and edge cases.
Read explainerMLB Ground-Rule Doubles and Fan Interference
MLB's 2026 rules for automatic two-base awards, spectator interference, wall-top balls, legal boundary catches, runner placement and replay.
Read explainerObstruction vs Interference
MLB's 2026 obstruction and interference rules: who is protected, when the ball is dead, base awards, outs, exceptions and worked rulings.
Read explainerTiming, restarts, and reviews
Clocks, substitutions, restarts, replay systems, reviews, and official procedure.
Baseball Appeal Plays and Missed Bases
MLB's 2026 appeal-play rules for missed bases, early tag-ups, live-ball procedure, deadlines, scoring, fourth outs, and replay review.
Read explainerBaseball Live Ball and Dead Ball Rules (MLB 2026)
MLB's 2026 live-ball and dead-ball rules explained: what stops play, delayed calls, runner awards, appeals, replay and how Play restarts the game.
Read explainerBaseball Substitution and Re-Entry Rules
MLB's 2026 substitution rules explained: lineup spots, unannounced substitutes, illegal re-entry, pinch roles and verified NCAA and Little League differences.
Read explainerMLB Replay Review and Challenge Rules
MLB's 2026 replay rules: manager challenges, crew-chief reviews, reviewable calls, clear-and-convincing evidence, runner placement, and ABS differences.
Read explainerPlay and decisions
The live-play rulings, sequences, and judgment calls that decide what happens next.
Baseball Balk Rules Explained
MLB's 2026 balk rule explained: illegal pitcher actions, legal pickoffs, one-base awards, delayed enforcement, disengagements and code differences.
Read explainerBaseball Designated Hitter and Lineup Rules
MLB's 2026 designated hitter rule: lineup-card requirements, substitutions, every way the DH is lost, and the starting pitcher/DH exception.
Read explainerBatting Out of Order
MLB's 2026 batting-out-of-turn rule: who is out, when to appeal, which advances stand, and how the batting order resumes.
Read explainerDropped Third Strike
MLB's 2026 uncaught-third-strike rule: when the batter may run, the first-base and two-out tests, live-ball exceptions, run scoring and scorebook treatment.
Read explainerMLB Catch and No-Catch Rules (2026)
MLB's 2026 catch rule explained: control, transfers, drops, collisions, boundary catches, tag-ups, replay review, and the exact outcomes.
Read explainerMLB Collision and Slide Rules Explained
MLB's 2026 collision and slide rules: home-plate contact, catcher blocking, bona fide slides, double-play interference, penalties and replay.
Read explainerMLB Strike Zone and Check Swing Rules 2026
MLB's 2026 strike zone and check swing rules: the human and ABS zones, half-swing appeals, live-ball effects, edge cases and rulings.
Read explainerTagging Up vs Force Plays
MLB's 2026 tagging-up and force-play rules: when a force begins or ends, caught-fly retouch appeals, third-out scoring, replay, and worked rulings.
Read explainerWhere baseball gets technical
- Force plays and appeals: when the force is still on, when it disappears, and how missed-base or leaving-early appeals change an inning.
- Interference and obstruction: who owns the running lane, when a fielder is protected, and how umpires award bases after illegal contact or blocking.
- Balks, dead balls, and awards: what stops play immediately, what stays live, and how runners are placed after the violation.
Use the printable baseball lessons
Move from reading the rule to making the call. Each free resource includes a teaching sequence, an eight-situation learner sheet, and a reasoned answer key.
- Force play or tag play? — forces, force removal, appeals, and run scoring.
- Obstruction or interference? — player priority, contact, intent, and award timing.
- Catch, no catch, or infield fly? — control, voluntary release, ordinary effort, and live-ball consequences.
Built for fast answers
- Start with the ruling first.
- Walk through the play event by event.
- Separate live-ball action from dead-ball awards.
- Show the one timing detail that changed the call.
Where these rulings come from
- MLB Official Information - MLB's official rules, glossary, replay, and umpire reference hub.
- MLB Rules Glossary - plain-language explanations of baseball rule terms and common rulings.
- MLB Infield Fly - the official glossary entry for one of baseball's most misunderstood calls.
- MLB Obstruction - the official explanation of obstruction and how base awards are handled.
- MLB Pitch Timer - the official glossary entry for pitch clock limits, violations, and disengagement rules.
- MLB Mound Visit - the official glossary entry for charged visits, limits, and visit exceptions.
- MLB Official Baseball Rules, 2026 edition - the current code, including Rule 5.10 on substitutions, pitching changes, and unannounced substitutes.
- MLB Automatic Runner - the official glossary entry for the regular-season extra-innings runner.
- MLB Designated Hitter Rule - the official glossary entry for DH lineup use, substitutions, and loss of the DH.
- MLB Hit-by-pitch Glossary - the official glossary entry for HBP awards, scoring, and umpire discretion.
- MLB Replay Review - the official glossary entry for manager challenges, crew-chief reviews, and reviewable calls.
- Little League Rules, Regulations, and Policies - youth-baseball rules and operational guidance where local interpretations often differ from pro baseball.