Why Do Teams Use a Five-Man Infield Late in Games?
Preventing one run can outweigh every other concern.
Teams use a five-man infield when stopping a run at home becomes the highest priority. The extra infielder increases the chance of fielding a ground ball before it reaches the outfield.
The alignment is most common in the final innings of close games with a runner on third base. In these moments, preventing a single run may be more important than preventing an extra-base hit.
By bringing an outfielder into the infield, the defense covers more ground on potential ground balls and line drives.
The trade-off is obvious. Fewer outfielders mean more open space beyond the infield, increasing the chance that a ball reaches the outfield safely.
Managers usually reserve the strategy for situations where one run could end the game or dramatically alter the outcome. It represents one of baseball's clearest examples of situational defense overriding conventional positioning.
