The Designated Hitter Rule: How the DH Actually Works

One batting place, two defensive realities

The designated hitter occupies a place in the batting order instead of the pitcher. The pitcher still takes the field as one of the nine defensive players; the DH normally does not play defence.

That means a team effectively separates one lineup role into two specialists: one pitches, the other hits. It does not add a tenth defender or an extra turn in the order.

The DH sits within MLB’s broader baseball rules and must be listed before the game.

The DH must be declared at the start

A team choosing to use the rule identifies its designated hitter on the starting lineup. If it starts without a DH, it cannot introduce one later in that game.

The selected DH must normally complete at least one plate appearance unless the opposing team changes pitchers first. This stops a manager from naming a purely nominal hitter and replacing that player immediately to manipulate matchups.

The batting-order position remains fixed even when the person occupying it changes.

Substituting for the DH

A pinch-hitter or pinch-runner can replace the DH. That substitute becomes the new designated hitter.

As with other MLB substitutions, a removed player cannot return. The team can cycle different hitters through the DH slot, but cannot create an extra movable batting position.

This differs from the infield fly rule, which changes a live-ball consequence; Rule 5.11 changes how a lineup is constructed across the entire game.

How a team loses the DH

If the DH takes a defensive position, the team loses the DH for the remainder of the game. The pitcher must then enter the batting order in the appropriate place created by the defensive changes.

The DH is also lost in specified switches involving the pitcher batting or moving to another defensive position. These provisions prevent a club from using the DH as a floating tenth player after it merges the hitter and fielder roles.

Once lost, the privilege cannot be restored later in the game.

The two-way starting-player rule

MLB amended the rule before the 2022 season for a player who starts as both pitcher and DH. For lineup purposes, the same person is treated as occupying two roles.

If removed as pitcher, the player may remain as DH. If replaced as DH, the player may continue pitching but no longer bats for that role.

The provision is associated with modern two-way players, but its legal importance is broader: it avoids forcing a team to abandon the DH merely because its best hitter also started on the mound.

From league difference to universal rule

The American League adopted the DH in 1973. The National League continued to require pitchers to bat in its parks for decades, creating different tactical cultures inside one major league.

The National League adopted the DH under the 2022–26 collective bargaining agreement. MLB thereby made the regular rule universal, after a temporary universal DH had also been used in 2020.

The change removed routine pitcher batting and much of the double-switch strategy that accompanied it. It did not make the DH simple: managers still have to preserve the role through every defensive and batting substitution.

International and domestic codes can still differ, just as softball and baseball rules share a family while using different fields, pitching actions and substitution structures.