the vaqueros won league pennants in the 1974–75, 1975–76, 1979–80 and 2001–02 seasons, winning the championship in its inaugural season and the right to represent puerto rico in the 1975 caribbean series, which was held at the hiram bithorn stadium in san juan, puerto rico. the bayamón club clinched the series and was managed by josé pagán, winning five games in a row before losing to the dominican republic's águilas cibaeñas in the closing game, 5 to 4.