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The 1992 Seattle Mariners season was their 16th since the franchise creation. The team finished seventh (last) in the American League West with a record of 64–98 (.395).
After a then franchise-best 83 wins the previous season, the Mariners finished with nineteen fewer, the largest one-year decline in team history. The team ownership was transferred in July from Jeff Smulyan to Nintendo president Hiroshi Yamauchi, and first-year manager Bill Plummer was fired after the season, succeeded by Lou Piniella in November for 1993.
Lefthanded starter Randy Johnson won the first of four consecutive strikeout titles with 241. In his third full season in the majors, 29-year-old third baseman Edgar Martínez batted .343 to lead the majors and win the first of his two American League batting titles. He hit .388 in July and .395 in August and was the league's player of the month for both.
Offseason
October 11, 1991: The Mariners decided not to bring back manager Jim Lefebvre, along with pitching coach Mike Paul for the 1992 season.
October 29, 1991: Third base coach Bill Plummer was promoted to manager.
Johnson, Lloyd, and Wolff, Miles, ed., The Encyclopedia of Minor League Baseball, 2nd and 3rd editions. Durham, North Carolina: Baseball America, 1997 and 2007