Luis Lou Castro, first Hispanic player in Major League Baseball.
MLB free-agency and trade tracker: Latest news and transactions - The Athletic
October 12, 1963: Latin American charity game is Polo Grounds' 'grand finale' – Society for American Baseball Research
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PIONEERS: Luis Castro. Third in a season-long series, by John Thorn
Luis Castro was baseball's first Latino player
He's in competition': What might the Pirates have in versatile new acquisition Mark Mathias?