José Colmenar del Valle Méndez was a Cuban right-handed pitcher and manager in baseball's Negro leagues. Born in Cárdenas, Matanzas, he died at age 43 in Havana. Known in Cuba as El Diamante Negro, he became a legend in his homeland. He was one of the first group of players elected to the Cuban Baseball Hall of Fame in 1939. He was elected to the National Baseball Hall of Fame and Museum in 2006.

The Cuban League was one of the earliest and longest lasting professional baseball leagues outside the United States, operating in Cuba from 1878 to 1961. The schedule usually operated during the winter months, so the league was sometimes known as the "Cuban Winter League."