pinch runner
US /ˈpɪntʃ ˌrʌn.ər/
UK /ˈpɪntʃ ˌrʌn.ər/

1.
corredor emergente, corredor sustituto
a baseball player who is substituted for another player on base, usually to provide more speed on the basepaths
:
•
The coach sent in a pinch runner to steal second base.
El entrenador envió un corredor emergente para robar la segunda base.
•
The veteran catcher was replaced by a speedy pinch runner.
El receptor veterano fue reemplazado por un veloz corredor emergente.