1998 Seattle Mariners season
Major League Baseball season

The Seattle Mariners 1998 season was their 22nd season, and was the final year in which Kingdome was the home venue for the entire season. Their record was 76–85 (.472) and they finished in third place in the four-team American League West, 11½ games behind the champion Texas Rangers.
The Mariners were the defending division champions, but exceeded the .500 mark only once during the season; at 19–18 after a win at Detroit on May 12. On July 18 at the Kingdome, Seattle (crimson, silver, and black) and the Kansas City Royals (yellow gold and blue) played a game in futuristic uniforms for "Turn Ahead the Clock" night. Shortstop Alex Rodriguez hit a three-run homer in the seventh inning and the Mariners won by three.
The Mariners traded future Hall of Famer pitcher Randy Johnson to the Houston Astros on July 31, receiving Freddy García, Carlos Guillén, and John Halama in return.
Ken Griffey Jr. hit 56 home runs to tie his franchise record set the year before. Rodriguez hit 42 home runs and stole 46 bases to become the third member of the 40–40 club, joining Jose Canseco (1988) and Barry Bonds (1996).
Offseason
November 13, 1997: Jalal Leach signed with the Mariners.
The public source identifies “1998 Seattle Mariners season” as major League Baseball season. This brief keeps that definition visible, then builds a research path around Seattle, Mariners and season.
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This entry incorporates text from “1998 Seattle Mariners season” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.