投手 is read as とうしゅ (toushu) and means pitcher.
とうしゅ
toushu
とうしゅせん
pitching duel
とうしゅりょく
pitching strength (of a team)
せんぱつとうしゅ
starting pitcher
こうたいとうしゅ
relief pitcher
しゅせんとうしゅ
top pitcher
せいとうしゅ
regular pitcher
めいとうしゅ
star pitcher
かちとうしゅ
winning pitcher
しょうりとうしゅ
とうしゅじん
pitching staff
とうしゅばん
pitchers plate
かいまくとうしゅ
opening-game pitcher