The Infield Fly Rule and Other Rules Fans Argue About
What the Official Baseball Rules actually say about the infield fly, the dropped third strike, balks, obstruction, force plays and the tie that does not go to the runner.
Most arguments at a rec-league game are not really about the rules. They are about half-remembered versions of the rules, repeated confidently by two people who are both slightly wrong. Here is what the book actually says, quoted by rule number from the 2026 edition of the Official Baseball Rules, so you can stop the argument rather than join it.
One caveat before we start. The Official Baseball Rules govern professional baseball. Little League, high school, college and every rec league write their own books, and they differ — sometimes in ways that matter. Where a difference is documented below, it is noted. Always check your own league's current rulebook.
The infield fly
The definition is narrower than most people think. An infield fly is a fair fly ball that an infielder can catch with ordinary effort, when first and second, or first, second and third are occupied, with fewer than two out.
Four details decide most arguments:
- It expressly excludes a line drive and an attempted bunt.
- It does not require an infielder to catch it, or even to touch it. The batter is out the moment the umpire declares it.
- The ball stays alive. Runners may advance at their own risk, or tag up, exactly as on any other fly ball.
- The pitcher, the catcher and any outfielder who has stationed himself in the infield all count as infielders for this rule.
There is no requirement that it be an easy catch, only an ordinary effort one — and the rulebook defines ordinary effort as what a fielder of average skill in that league should manage. That is a standard about the league, not about the fielder standing there.
Foul territory is the one part people get backwards. If a declared infield fly falls untouched and bounces foul before passing first or third, it is a foul ball. If it falls untouched outside the line and bounces fair before passing the bag, it is an infield fly and the batter is out.
The dropped third strike
The batter becomes a runner on an uncaught third strike when first base is unoccupied, or when first base is occupied with two out (Rule 5.05(a)(2)). The mirror rule, 5.09(a)(3), makes the batter out on an uncaught third strike when first is occupied before two are out.
The condition people forget is the second one. With a runner on first and two out, the batter can run. With a runner on first and one out, he cannot.
This is also a genuine division-level difference in youth ball. Little League's published tournament playing rules apply the uncaught third strike in the 9- to 11-Year-Old Division but switch it off for the 8- to 10-Year-Old Division. If you coach young players in more than one programme, check which applies.
Balks
Rule 6.02(a) lists thirteen separate balk actions. The point of all of them is the same: a pitcher may not deliberately deceive a runner. The penalty is that the ball is dead and each runner advances one base.
Three that come up constantly in rec ball:
- Starting any motion naturally associated with the pitch and then not delivering it.
- Feinting a throw to first or third without completing it. A feint to second is legal.
- Delivering from the Set Position without coming to a complete stop.
And the answer to the most common dugout question: yes, the rulebook treats it differently with nobody on. A balk requires a runner. With the bases unoccupied, an illegal pitch is simply called a ball (Rule 6.02(b)). A quick pitch is a balk with runners on and a ball without.
Obstruction versus interference
These get used interchangeably and they are close to opposites.
Obstruction is committed by the defence. It is the act of a fielder who, while not in possession of the ball and not in the act of fielding it, impedes a runner. The rulebook's clearest illustration is the note under Rule 6.01(h): a catcher without the ball has no right to block the path of a runner trying to score.
Interference is mostly committed by the offence — an act by the team at bat that hinders a fielder attempting to make a play. The rules also recognise defensive interference (a fielder hindering the batter's swing), umpire's interference and spectator interference.
The test that resolves almost every case: who has the ball, and who is doing the impeding. A fielder without the ball who gets in a runner's way has obstructed. A runner who gets in the way of a fielder making a play has interfered.
The obstruction penalty splits in two. If a play is being made on the obstructed runner, or the batter-runner is obstructed before reaching first, the ball is immediately dead and the obstructed runner is awarded at least one base beyond the last base legally touched. If no play is being made, the play runs to its conclusion and the umpire then imposes whatever nullifies the obstruction.
The tie does not go to the runner
This one is settled. Rule 5.09(a)(10) says the batter is out when, after a third strike or after hitting a fair ball, he or first base is tagged before he touches first base.
That is a straight before-or-after comparison. There is no tie provision anywhere in the Official Baseball Rules — the phrase "tie goes to the runner" does not appear in the book at all. Read literally, a genuinely simultaneous arrival would mean the batter is not out, because the tag did not come before he touched the base. But umpires are trained that there are no ties: one of the two happened first, and the umpire's job is to decide which. Either way, the folk rule is not a rule.
The ground-rule double that usually is not one
A fair ball that bounces over the fence is not a ground-rule double. It is a codified two-base award under Rule 5.05(a)(6), which applies in every park in baseball. Related provisions cover a ball going through or under a fence, a bounding ball deflected out of play, and a fly deflected out of play.
An actual ground rule is something different: Rule 4.05 lets the home manager propose park-specific rules covering spectator overflow, balls hit into odd corners, and similar local quirks. If the opposing manager agrees they stand; if not, the umpire-in-chief sets them. Critically, a ground rule may not conflict with the playing rules. Little League goes further for tournaments, requiring written ground rules reviewed with both managers before the game.
So the tarp, the gap under the fence and the tree branch over left field are ground rules. The ball that took one hop into the stands is just a two-base award.
Force plays, and when the force disappears
A force play is one in which a runner legally loses his right to occupy a base because the batter became a runner. That is the whole definition, and it explains the thing that confuses everyone: the force can vanish mid-play.
The rulebook's own example is the one to memorise. Runner on first, one out, ground ball to the first baseman who steps on the bag to retire the batter-runner. The force is removed at that moment, and the runner going to second must now be tagged — touching the base is not enough.
This matters for runs. If that trail runner is tagged for the third out, a run that crossed the plate before the tag counts, because it was not a force out. Had the first baseman thrown to second for a force out and then back to first, no run would score.
Sources
- Official Baseball Rules, 2026 Edition (Office of the Commissioner of Baseball)
- MLB Official Information and rules
- Little League — Explanation of the Infield Fly Rule
- Little League — Tournament Playing Rules, baseball