re: Baseball Fly out / Tag-up Question

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Runners are permitted to advance when a batted fly ball (fair or foul) is caught for an out. The runner must touch or retouch his base any time after the ball is caught before advancing to the next base. If the runner fails to tag up or “leaves too early” he may be put out on appeal. The appeal can be a “continuous appeal” which is when the defensive fielder tags the runner or the vacated base before time is called. Or, the appeal can happen after time is called and the defensive team puts the ball back in play and tags the runner or touches the runner’s original base.

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