Live ball or dead ball?

How umpires check it

1. Start with the default: the ball is live after the umpire puts it in play.
2. Ask whether a specific rule made it dead, such as an uncaught foul ball, hit by pitch, certain interference, a ball leaving play, or the umpire calling Time.
3. If the ball is live, allow runners and fielders to keep playing until an out, tag, throw, appeal, or other action ends the sequence.
4. If the ball is dead, stop ordinary action and decide whether runners return or receive base awards.
5. Restart only when the conditions are ready and the plate umpire calls or signals Play.

What live ball means

A live ball means the game is active. The pitcher may pitch, the batter may hit, runners may advance at their own risk, fielders may try for outs, and legal appeals can still matter.

The ball is not dead just because the main action looks finished. A runner can still be tagged after overrunning a base in the wrong situation, the defence can make an appeal, or a loose ball can allow an extra base if no rule has stopped play.

What dead ball means

A dead ball is out of play. The umpire has stopped active action, or a rule has stopped it automatically. During that period, ordinary tags, force plays, steals, and throws do not create new outs.

That does not mean nothing can change. Runners may be awarded bases because of the live-ball act that caused the dead ball, such as a ball thrown out of play, a fair batted ball leaving the field, interference, obstruction, a balk penalty, or a hit by pitch with runners forced to advance.

Events that usually stop play

• Uncaught foul ball: the ball is dead and runners return unless another rule creates a different result.
• Hit by pitch: the batter is awarded first if the rule's conditions are met, and forced runners advance.
• Ball out of play: throws into stands, fair batted balls over a boundary, and balls lodged in equipment or fencing can create dead-ball awards.
• Interference: many forms of offensive, spectator, coach, or umpire interference kill the play, though the exact placement depends on the rule.
• Umpire's Time call: once the umpire grants Time, the ball is dead until Play is called.

Some calls are delayed

Not every violation makes the ball dead immediately. Some rulings are delayed so the umpire can see whether the offence is better off with the result of the play or with the penalty.

Obstruction is the clearest example. If no immediate play is being made on the obstructed runner, the umpire may signal obstruction but let action continue, then award bases after the play ends. Catcher interference can also involve an option if the batter and runners achieve a better result during the play.

Where runners go

Dead-ball placement is not one universal award. The rule that killed the ball controls whether runners return, move one base, move two bases, score, or are placed where the umpire judges they would have reached.

• Return: on an ordinary uncaught foul ball, runners usually return to their time-of-pitch bases.
• One base: a hit by pitch normally awards the batter first, with forced runners advancing.
• Two bases: many fair batted balls or throws that go out of play create two-base awards, but the timing point can differ by play.
• Judgment placement: obstruction and spectator interference often require the umpire to nullify the illegal act as closely as possible.

How the ball becomes live again

After a dead ball, play does not restart just because the pitcher has the ball or a runner steps on a base. The plate umpire must put the ball back in play, commonly after the pitcher is on the pitcher's plate with the ball and the batter, catcher, and umpire are ready.

This matters on appeals and missed bases. If the ball is dead after a base award, the defence may need to wait until the umpire puts the ball back in play before making a live-ball appeal, unless the applicable rule set allows a dead-ball appeal procedure.

"Time" is not called by players

Players and coaches can request Time, but only an umpire's call or signal actually stops play. A runner who slows down because a fielder asks for Time is still at risk if the umpire has not granted it.

Umpires also avoid calling Time while active play is still developing except in specific safety or rule situations. If a ball is loose, a runner is advancing, or the defence is still trying for an out, expect the umpire to let the play finish before granting Time.

"The play is over, so the ball is dead"

The end of visible action is not the same as a dead ball. A flyout, tag play, pickoff attempt, rundown, or throw back to the infield may leave the ball live. Runners still need to stay aware until Time is granted or the next pitch sequence begins.

This is why baseball rewards knowing the ball status. A defence that assumes a dead ball may stop chasing a live loose ball. An offence that assumes Time has been called may give away an avoidable out.

Four plays to separate them

• Pitch is fouled straight back into the screen: dead ball, runners return, and the count changes according to the foul-ball rule.
• Foul tip goes sharp and direct to the catcher's glove and is legally caught: live ball, strike, and runners may advance at their own risk.
• Fair ground ball deflects off an infielder and rolls away: usually live ball, so runners may advance and fielders may still make outs.
• Thrown ball goes into the stands: dead ball, and the umpire awards bases based on the rule and timing of the throw.

Where details can vary

The live-ball and dead-ball framework is common across baseball, but amateur, youth, school, tournament, and local ground rules can change procedures or awards in specific situations.

Examples include dead-ball appeal mechanics, local boundary rules, safety-related stoppages, courtesy-runner administration, and special tournament rules. For a real game, use the rule book adopted by that competition and any local ground rules announced before the game.

Source material

• MLB Dead Ball Glossary
• MLB Official Baseball Rules: Rules 5.06(c) and 5.12
• MLB Foul Ball Glossary
• MLB Foul Tip Glossary
• MLB Obstruction Glossary
• MLB Spectator Interference Glossary
• Little League Rules, Regulations, and Policies