As manager José María Tranquilino Fernández Marín Sr. (June 6, 1896  – July 20, 1972) was a Cuban baseball catcher, first baseman, right fielder and manager in the Negro leagues from the 1910s to the 1940s.

A native of Guanabacoa, Cuba, Fernández was the brother of fellow Negro leaguer Rudy Fernández.

[1] He managed the New York Cubans for 12 consecutive seasons from 1939 to 1950.

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