An earlier incarnation of the Potros (or Colts) de Tijuana played in the short-lived Sunset League from 1949–1950 (originally as the Salinas Colts), and moved to the Southwest International League from 1951–1952. After three years of absence, they became a member of the Arizona–Mexico League during the 1956 season.
Mexican Pacific League
Potros de Tijuana joined the Mexican Pacific League in 1977, taking championship titles in the 1987–1988 and 1990–1991 seasons to advance to the Caribbean Series in both times.[1]
Mexican League
The franchise actually was a descendant of the Triple-A Toros de Tijuana before the Mexican League reportedly to have stripped the Toros owner of his franchise and gave it to new owners, who renamed the team as the Potros de Tijuana. The team played its games at Estadio Calimax.[2][3]
The new Toros ownership kept the same team name, logo, uniforms and history, as a result of the alleged political wrangling that went on in that league.[4]
On 13 January 2009, the league officially welcomed the Potros. They were to join fellow expansion teams, the Tucson Toros and Victoria Seals.
On 7 May 2009 the GBL announced the postponement of the Potros' inaugural season until 2010 due to Mexico's swine flu outbreak and the subsequent health risk and precautionary measures that resulted from it.[8]