SRSport Rules
Baseball

Infield fly, without the trap.

The infield fly rule exists to stop fielders from deliberately letting a simple pop-up drop so they can turn an easy double or triple play. The hard part is knowing when the rule is available and when the umpire should call it.

Quick ruling: with first and second occupied, or the bases loaded, and fewer than two outs, an ordinary infield pop-up can be called an infield fly so the batter is out immediately.
Decision path

How the umpire checks it

  1. Check the number of outs. With two outs, there is no infield fly.
  2. Check the runners. It only applies with runners on first and second, or bases loaded.
  3. Judge the batted ball. It must be a fair fly ball, not a line drive or bunt.
  4. Decide whether an infielder could catch it with ordinary effort.
  5. If all of that is true, the umpire calls infield fly and the batter is out whether the ball is caught or not.
What changes it

Details fans miss most

  • It is about protection: the rule removes the cheap force-play trick against runners who have to stay near their bases.
  • Ordinary effort matters more than exact position: an outfielder running in can still produce an infield fly if the play is routine for an infielder area ball.
  • The ball stays live: runners may still advance at their own risk after the call.
  • Not every pop-up qualifies: bunts and sharp liners are excluded even if they go high.
Common argument

"He dropped it, so why is the batter out?"

Because the rule is designed for exactly that situation. Once the umpire calls infield fly, the defence cannot gain the force-play advantage from choosing not to catch the ball.