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 .470 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. 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

Regular season

Season standings

Record vs. opponents

Opening Day starters

Notable transactions

Roster

Major League debuts

Game log

Source:

Player stats

Batting

Starters by position

''Note: Pos = Position; G = Games played; AB = At bats; R = Runs; H = Hits; HR = Home runs; RBI = Runs batted in; Avg. = Batting average; Slg. = Slugging average; SB = Stolen bases''

Other batters

''Note: G = Games played; AB = At bats; R = Runs; H = Hits; HR = Home runs; RBI = Runs batted in; Avg. = Batting average; Slg. = Slugging average; SB = Stolen bases''

Starting pitchers

Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; SO = Strikeouts; BB = Walks allowed

Other pitchers

Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; SO = Strikeouts; BB = Walks allowed

Relief pitchers

Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; SV = Saves; ERA = Earned run average; SO = Strikeouts; BB = Walks allowed

Ken Griffey Jr.'s 56 home runs

Awards and honors

Source:

Farm system