Tag up
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In baseball
Baseball
Baseball is a bat-and-ball sport played between two teams of nine players each. The aim is to score runs by hitting a thrown ball with a bat and touching a series of four bases arranged at the corners of a ninety-foot diamond...

, to tag up is to retouch or remain on the runner's time-of-pitch base until (after) the ball either lands in fair territory or is first touched by a fielder. A runner must, by rule, tag up only when a batted ball is caught by a fielder (without touching the ground). After a legal tag up, even if the ball was caught in foul
Foul ball
In baseball, a foul ball is a batted ball that:* Settles on foul territory between home and first base or between home and third base, or* Bounds past first or third base on or over foul territory, or...

 territory, runners are free to attempt to advance. On long fly ball outs, runners can often gain a base; when a runner scores by these means, this is called a sacrifice fly
Sacrifice fly
In baseball, a sacrifice fly is a batted ball that satisfies four criteria:* There are fewer than two outs when the ball is hit.* The ball is hit to the outfield....

. On short fly balls, runners seldom attempt to advance after tagging up.

After a caught fly ball, a fielder with the ball can appeal that the runner did not retouch his time-of-pitch base after the ball was touched by a fielder by touching the runner or the runner's time-of-pitch base before he retouches the base, thus tagging the runner out
Out (baseball)
In baseball, an out occurs when the defensive, or fielding, team effects any of a number of different events, and the umpire rules a batter or baserunner out. When a player is called out, he is said to be retired...

. If the umpire agrees that the runner did not retouch after the ball was touched by a fielder, the umpire will call the runner out, regardless of what the runner had done after the ball is in play. This is a timing play, not a force play. All runs which score before the appeal will count (except those scored by runners that are called out).
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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