The Ostioneros played in the Mexican Pacific League and used the Estadio Abelardo L. Rodríguez as their home ballpark.

[1] The team won pennant titles in the 1947–48 and 1950–51 seasons, managed by Juan Guerrero and Luis Montes de Oca, respectively.

[2] In 1950–51, Ostioneros shared the league championship with the Tacuarineros de Culiacán.

[1] This is considered the beginning of the modern era of what is now the Mexican Pacific League.

The Guaymas club also competed in this second stage, winning titles in 1958–59 and 1959–60 guided by Manuel Magallón, in 1962–63 and 1964–65 with Guillermo Frayde at the helm,[4] and 1967–68 with Ronaldo Camacho, to won seven league titles in both stints.