1984 Seattle Mariners season

The Seattle Mariners season was their eighth since the franchise creation. They finished fifth in the American League West with a record of.

Offseason

November 21, 1983: Bill Caudill and Darrel Akerfelds were traded to the Oakland Athletics for Dave Beard and Bob Kearney.
December 5, 1983: Dave Geisel was selected by the Mariners from the Toronto Blue Jays in the rule 5 draft.
January 17, 1984: Mike Blowers was selected in the eighth round of the amateur draft, but did not sign.
March 23, 1984: Rick Sweet was released by the Mariners.

September 1 – Manager Del Crandall was fired on Saturday morning, September 1, succeeded by third base coach Chuck Cottier.
First baseman Alvin Davis reached base in each of the first 47 games of his career, and was chosen for his only All-Star Game. The M's MVP, he was also voted the American League's [Major League Baseball Major League Baseball Rookie of the Year Award|Rookie of the Year Award|Rookie of the Year], with a.284 batting average, 27 home runs, and 116 RBIs.
Lefthanded starting pitcher Mark Langston became the first rookie since Herb Score to lead the American League in strikeouts; he was second in the balloting to teammate Davis for AL Rookie of the Year

Note: Pos = Position; G = Games played; AB = At bats; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in

Note: G = Games played; AB = At bats; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in

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

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

Note: G = Games pitched; W = Wins; L = Losses; SV = Saves; ERA = Earned run average; SO = Strikeouts