Explaining the Tag-up Rule in Baseball

A full-time MBA student at the University of Rochester, Joseph “Joe” Vessecchia is a former software sales professional who is pursuing a career in finance. He last worked as an account executive at Quick Base. Outside of his professional endeavors, Joseph Vessecchia enjoys playing tennis and baseball.

The sport of baseball is governed by many rules, one of which prevents base runners from advancing while the ball is in the air. Known as the tag-up rule, this forces base runners to make quick decisions as to whether they should try to advance to the next base in the event of a fly ball. If the ball is hit deep enough in the outfield, the runner can stay on their respective base and dash toward the next base once the ball has been caught, so long as there are less than two outs.

If the runner attempts to advance bases before the ball has been caught and the fielder catches the batter out, the fielder can throw the ball to the original base on which the runner was standing, and an additional out is recorded if the ball beats the runner back to the base. Runners don’t have to worry about this when there are two outs, as the half-inning is over if a fly ball is caught in this situation. Conversely, if the ball isn’t caught, the runner can get a head start in rounding the bases.

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