He served as the pitcher in today's game.
He was the ace pitcher on his high school baseball team.
投手がマウンドに立つ。
The pitcher stands on the mound.
He took the mound as the pitcher in the ninth inning.
The manager changed pitchers in a tight situation.
投手 throws the ball to the batter, while 捕手 is the catcher who receives it—an opposing pair on the same team known as the battery.
投手 is the pitcher, while 野手 refers to any defensive player other than the pitcher (and catcher, depending on context).
打者 is the player who bats, while 投手 is the pitcher who throws to them—the two opposing roles in a baseball at-bat.
投球 refers to the act of pitching or the pitched ball itself, while 投手 refers to the pitcher, the person who throws it.
counter for people
star pitcher; ace pitcher
left-handed pitcher
pitching strength; pitching depth
pitching duel; pitchers' battle
pitcher's plate; rubber
pitching staff; pitching corps
regular pitcher; starting pitcher
ace pitcher; top pitcher
Compound of 投 (throw) and 手 (hand/person), literally 'throwing hand' or 'thrower'.
relief pitcher
starting pitcher