<span id="Amateur_baseball" class="mw-headline">
In
baseball, the
designated hitter rule is the common name for
Major League Baseball Rule 6.10,<sup id="cite_ref-0" class="reference">
<font size="2"><span>[</span>1<span>]</span></font> an official position adopted by the
American League in 1973 that allows teams to designate a player, known as the
designated hitter (abbreviated
DH), to bat in place of the
pitcher each time he would otherwise come to home plate, rather than letting the pitcher bat. Since then, most collegiate, amateur, and
professional leagues have adopted the rule or some variant; MLB's
National League and
Nippon Professional Baseball's
Central League, are the most prominent professional leagues that do not use a designated hitter.</p>
Amateur baseball</span>
The use of the designated hitter rule in amateur baseball is nearly universal. The primary difference between the DH in the professional and amateur games is that the DH may bat in place of one player in any position in most amateur baseball leagues such as those that use
National Federation of State High School Associations (NFHS)
rules. Most high school coaches use a designated hitter in place of the weakest hitter in the lineup, if they use one at all. In amateur baseball, many pitchers are also good hitters and will often play another position (or even DH) when not pitching. Professional pitchers usually focus exclusively on improving their pitching, thus their batting skills often deteriorate compared to their teammates. However, in Canada, the DH must bat for the pitcher still.</p>
One notable exception to the NFHS designated hitter rule in youth baseball is
American Legion baseball. Legion rules exactly follow those prescribed in the Official Baseball Rules, which allow the DH only to bat for the pitcher. Prior to 1995, the use of the DH was not allowed in Legion baseball.
Japanese high school baseball is one of the few amateur baseball leagues in the world that has never used the designated hitter rule at all. In South Korean high school baseball, the rule has been adopted since 2004.</p>
In college baseball, NCAA rules state that the designated hitter must hit for the pitcher, but in many instances the pitcher is also a good hitter, and the coach may elect to let the pitcher bat in the lineup. If the pitcher opts to bat for himself, he is treated as two separate positions — a pitcher and a designated hitter (abbreviated P/DH on the lineup card) — and may be substituted for as such (i.e. if he is removed as the pitcher, he may remain as the designated hitter and vice versa). However, if a player who starts a game as a P/DH is relieved as the starting pitcher, he may not return to the mound even if he remains in the game as the DH, and he may not play any other defensive position after being relieved as the pitcher. Conversely, a player who begins the game as the DH, but not as the pitcher, may come into the game as a reliever and remain as the DH (in effect becoming a P/DH), be relieved on the mound later in the game but continue to bat as the DH.</p>