"An infield fly is a fair fly ball (not including a line drive nor an attempted bunt) which can be caught by an infielder with ordinary effort, when first and second, or first, second and third bases are occupied, before two are out," says Rule 2.00 in the definition of terms. "The pitcher, catcher and any outfielder who stations himself in the infield on the play shall be considered infielders for the purpose of this rule."
"The umpire is to rule whether the ball could ordinarily have been handled by an infielder -- not by some arbitrary limitation such as the grass, or the base lines," it says. "The umpire must rule also that a ball is an infield fly, even if handled by an outfielder, if, in the umpire's judgment, the ball could have been as easily handled by an infielder. The infield fly is in no sense to be considered an appeal play. The umpire's judgment must govern, and the decision should be made immediately."
