Ostioneros de Guaymas

• Location: Guaymas, Sonora
• League: Mexican Pacific League 1945-1952, 1958-1970, 1972-1978, 1983-1990
• Stadium: Estadio Abelardo L. Rodríguez

The Ostioneros de Guaymas (Oystermen) played in the Mexican Pacific League between 1945-1991. They won seven titles, all before Mexico joined the Caribbean Series. Alfredo Ríos was a big star for the team. The name has since been used by lower-level clubs in Guaymas, Sonora. At the start of the 1980's the team had a player development agreement with the Seattle Mariners that lasted four years whereby they were renamed the Marineros de Guaymas.

Yearly Record

Year	Record	Manager	Playoffs
1945-46	28-26	Agustín Bejerano	Runner Up
1946-47	31-23	Ezequiel Cruz	Runner Up
1947-48	38-22	Juan Guerrero	Champions
1948-49	18-42	Juan Guerrero
1949-50	27-33	Clint Courtney
1950-51	37-23	Luis Montes de Oca	Champions
1951-52	28-29	Luis Montes de Oca
1952-53	13-20	Luis Montes de Oca
1958-59	22-14	Manuel Magallón	Champions
1959-60	31-17	Manuel Magallón	Champions
1960-61	34-20	Manuel Magallón	Runner Up
1961-62	24-35	Manuel Magallón
1962-63	32-28	Guillermo Frayde	Champions
1963-64	42-38	Guillermo Frayde	Runner Up
1964-65	47-33	Guillermo Frayde	Champions
1965-66	37-45
1966-67	39-46
1967-68	58-36	Ronnie Camacho	Champions
1968-69	23-36	Guillermo Frayde
1969-70	19-43
1970-71	27-59
1971-72	Did not enter
1972-73	44-42
1973-74	40-44
1974-75	36-45
1975-76	38-48
1976-77	33-33		1st Round
1977-78	25-46
1978-79	30-41
1983-84	36-36	Raul Cano	Runner Up
1984-85	27-45		1st Round
1985-86	45-27	Mike Brito	1st Round
1986-87	39-23		1st Round
1987-88	26-33		1st Round
1988-89	44-41		1st Round
1989-90	27-41	Mike Brito	Semi Final
1990-91	36-32		1st Round