In baseball, a triple is the act of a batter safely reaching third base after hitting the ball, with neither the benefit of a fielder's misplay (see error) nor another runner being put out on a fielder's choice. A triple is sometimes called a "three-bagger" or "three-base hit". For statistical and scorekeeping purposes it is denoted by 3B.
Triples have become somewhat rare in Major League Baseball, less common than both the double and the home run. This is because it requires a ball to be hit solidly to a distant part of the field (ordinarily a line drive or fly ball near the foul line), or the ball to take an irregular bounce in the outfield, usually against the wall, away from a fielder. It also requires that the batter is a speedy enough runner to make it all the way to third base in time, and that the batter's team have a good strategic reason for wanting the batter on third base, as a stand-up double will already put the batter in scoring position and there will often be little strategic advantage to taking the risk of trying to stretch a double into a triple. On the extreme, the triple may be stretched into the very rare inside-the-park home run. The trend for modern ballparks is to have smaller outfields (generally increasing the number of home runs), ensuring that the career and season triples leaders mostly consist of those who played early in Major League Baseball history, particularly in the dead-ball era.
A walk-off triple (one that ends a game) occurs very infrequently. In general, game-winning hits with a runner on first base are walk-off doubles, since it is quite common for runners starting on first base to score on a double (as it is to make it from first to third on a single). For example, in 2019, there was not a single walk-off triple.
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