A symbol of Mexican pride, the slugging Espino declined offers from the Cardinals, Mets, and Padres while playing 25 seasons with San Luis de Potosi, Monterrey, and Tampico. He did play 32 games for Jacksonville (International League) in 1964, batting .300, but was offended by racial discrimination and swore he would never again play in the United States. He led the Mexican League in batting in 1964 and in 1966-68; in home runs in 1964 and 1972; and in RBI in 1962 and 1973. His Mexican League record of 46 HR, set in 1964, stood until 1986. He retired at age 45 with the career record for minor league home runs, 484.