A tag up occurs when a runner waits for a catch before advancing. The runner must touch their original base after a fly ball is caught cleanly. Once the fielder secures the ball the runner can sprint to the next bag. If the runner leaves too early the defense can record a double play out. A runner on third base waits for the left fielder to catch ball. The runner tags the bag and sprints home to score a sacrifice fly run. This rule ensures the defense has a fair chance to catch the fly ball. Runners must watch the outfielder closely to time their departure from the base bag. Proper tagging up is essential for scoring runs on fly balls during a game.
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