Roldán Guillén led the 1964-1965 Serie Nacional with nine intentional walks while pitching for the Orientales. Overall, he pitched for 7 seasons in Cuba, going 20-25 with a 2.25 ERA in 95 games (39 starts) during a pitcher-friendly era. He allowed only a .191 opponent average but walked 218 in 340 innings.
Source: 2005 Guia Official de Beisbol
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