Tag up

In baseball, to tag up is for a baserunner to retouch or remain on their starting base (the time-of-pitch base) until (after) the ball either lands in fair territory or is first touched by a fielder. By rule, baserunners must tag up when a fly ball is caught in flight by a fielder. After a legal tag up, runners are free to attempt to advance, even if the ball was caught in foul territory.^[1] On long fly ball outs, runners can often gain a base; when a runner scores by these means, this is called a sacrifice fly.^[2] On short fly balls, runners seldom attempt to advance after tagging up, due to the high risk of being thrown out.

When a baserunner fails to tag up on a caught fly ball (for instance, if they started running too early, thinking the ball wouldn't be caught), they may be "doubled off", which results in them being called out. To double a runner off, a fielder must touch the runner's starting base while in possession of the ball, before the runner returns to the base. If the baserunner appeared to tag up, but a fielder suspects the baserunner may have left the base too early (thus failing to legally tag up), the fielder may attempt to double the runner off by touching the runner's starting base while controlling the ball, before the next pitch is thrown. This is considered a type of appeal play.^[3] 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, and anything else the runner did during the play (such as score a run) is negated. Doubling a runner off is considered a "time play" (as opposed to a force play), which means that even if the doubling-off is the third out of an inning, any runs which score before the double-off will count (unless the run was scored by the same runner that was doubled off, in which case the run will not count in any situation).

References

↑ Major League Baseball Rules, Rule 7.08(d)
↑ Major League Baseball Rules, Rule 10.08(d)
↑ Major League Baseball Rules, Rule 7.10(a)

Baseball concepts

Rules	Rules of baseball Ground rules Infield fly rule Interference

Field	Backstop Baseball diamond Batter's box Batter's eye Bullpen Dugout Foul territory Foul pole Infield On-deck circle Outfield Warning track

Equipment	Ball Bat Batting cage Batting glove Batting helmet Cap Doughnut Glove (defense) Pitching machine Protective cup Shin guard Stirrups Uniform Uniform number

Game process	Batting order Extra innings Innings On-deck Out Run Seventh-inning stretch

Batting	At bat Baltimore chop Bat flip Chinese home run Batting count Bunt Checked swing Cleanup hitter Designated hitter Double Double switch Foul ball Foul tip Grand slam Ground rule double Hit Hit and run Hit by pitch Hitting for the cycle Home run Infield hit Inside-the-park home run Leadoff hitter Lefty-righty switch Line drive Moonshot Plate appearance Platoon system Pull hitter Sacrifice bunt Sacrifice fly Single Slap bunt Strikeout Strike zone Sweet spot Triple Walk Walk-off home run

Pitching	Balk Beanball Breaking ball Brushback pitch Changeup Curveball Eephus Fastball Full count Inside pitching Knuckleball No-hitter Passed ball Perfect game Pitch count Pitchout Quick pitch Screwball Shutout Slider Spitball Strikeout Striking out the side Time of pitch Wild pitch

Baserunning	Balk Bases loaded Caught stealing Contact play Left on base Safe Scoring position Slide Small ball Squeeze play Stolen base Tag up

Fielding	Appeal play Assist Catch Defensive indifference Double play Error Fielder's choice Force play Fourth out Hidden ball trick Infield shift In-between hop Pickoff Rundown Tag out Triple play Unassisted triple play Wall climb Wheel play

Miscellaneous	Bench jockey Bench-clearing brawl Blocking the plate Dead ball Golden sombrero Baseball jargon In flight Pepper Scorekeeping Shagging Slump Uncaught third strike

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