Looking around Memorial Stadium before Game 1 of the 1983 World Series, Philadelphia Phillies star Gary Matthews saw a lot of Black talent. Joe Morgan. Eddie Murray. Garry Maddox. Ken Singleton. Al Bumbry. Disco Dan Ford. And plenty more that night in Baltimore. “There were quite a few of us,” Matthews recalled. When fans watch the Houston Astros and Phillies line up this week to begin the Fall Classic, it will be a much different picture. To be sure, Houston’s Jose Altuve and Philadelphia’s Jean Segura are among scores of Latin players helping keep big league rosters diverse. But for...