IPA: /ˈbɔːlˌpleɪə/
KK: /ˈbɔlˌpleɪər/
A person who plays a game involving a ball, particularly in sports like baseball or basketball.
The ballplayer hit a home run during the game.
Ballplayer → It is formed from "ball" (from Old English *beall*, meaning a spherical object used in games) and "player" (from Old French *plaier*, meaning to engage in a game or sport). The word "ballplayer" refers to a person who plays a game involving a ball.
Think of a 'spherical object' ('ball') that someone is 'engaging in a game' ('player') with — that's what a ballplayer does.