Infield Fly Rule

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The Infield Fly Rule is a rule in baseball that prevents unfair gamesmanship by the fielders. The infield fly rule applies when there are fewer than 2 outs, and there are runners on first and second base, or on first, second and third base. In these situations, if a fair fly ball is hit that, in the umpire's judgment, is catchable by an infielder with ordinary effort, the batter is out regardless of whether the ball is actually caught in flight. The rule states that the umpire is supposed to announce, "Infield fly, if fair". If the ball will be almost certainly fair, the umpire will likely yell, "Infield fly, batter's out!" or just "Batter's out!"

The effect of the call is much the same as if the ball had been caught, even if the ball drops to the ground. The runners may tag up and attempt to advance if the ball is caught, but the force play that would have been available to the fielders is eliminated. If the ball is not caught, runners need not tag up.

History

This rule was introduced in 1895, in response to infielders intentionally dropping pop-ups in order to get multiple outs by forcing out the runners on base, who were pinned near their bases while the ball was in the air.

It is a cousin to the third-strike rule. A batter who swings and misses a third strike which is not caught may try to advance to first, unless first base is occupied and there are fewer than two outs. That rule prevents the catcher from getting force-out opportunities by deliberately dropping a missed third strike, potentially resulting in a double or triple play.

Misconceptions

Participants and fans often misunderstand the infield fly rule. The infield fly rule is not in effect if there is a runner on first only, as the rules makers assumed fielders would not gain a significant advantage by forcing out the runner rather than the batter; in either case, the net result would be one more out and a runner on first base. Also, an infield fly does not affect baserunners other than the batter. Just like any other fly ball, if an infield fly is caught, runners must retouch (or "tag up") their time-of-pitch base before attempting to advance; if an infield fly is not caught, no tag up is required and the runners may try to advance.

The infield fly rule cannot be invoked on line drives or bunts; also, the infield fly rule is not intended to cover all situations where the defense may wish to allow a fly ball to drop uncaught. For example, with just a runner on first, an alert infielder might purposely let a popup drop to the ground and get the force at second, if it happens that the runner on first is faster afoot than the batter-runner is. This is only legal if the fielder lets the ball hit the ground untouched, which carries some risk to the fielder as it might bounce away from him. However, in all situations where the infield fly rule does not apply, a different rule prevents fielders from touching a catchable ball and dropping it intentionally in an attempt to turn a double or triple play.it:Infield fly ja:インフィールドフライ