first-baseman

US /ˌfɝːst ˈbeɪs.mən/

UK /ˌfɝːst ˈbeɪs.mən/

in baseball, a fielder (= a player who tries to catch or stop the ball) who stands close to first base (= the first of the places that a player has to touch in order to score), and who is responsible for trying to put out players (= end their turn) before they reach that base:

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Hernandez was an outstanding defensive first baseman.

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