1990 Seattle Mariners season

The 1990 Seattle Mariners season was the 14th for the Seattle Mariners in Major League Baseball. Under second-year manager Jim Lefebvre, they finished fifth in the American League West at. It was the second-best record in the M's history up to that point in time; the win total was one behind the club record set in 1987. The Mariners hit six grand slams, the most in MLB in.

Offseason

June 2: Randy Johnson threw a no-hitter versus the Detroit Tigers, the first for the franchise. He was also the tallest pitcher in Major League history to throw a no-hitter. It was the 2101st game in Mariners history, played on a Saturday night in the Kingdome.
September 14: Ken Griffey Sr. and Ken Griffey Jr. hit back-to-back home runs in the top of the first inning against the California Angels. Through, it remains the only occurrence of consecutive homers by a father and son in MLB history.

June 4: 1990 Major League Baseball draft
*Marc Newfield was selected by the Mariners in the first round, and he signed on June 10.
*Bret Boone was selected by the M's in the fifth round, and he signed on June 8.
June 18: Darnell Coles was traded by the Mariners to the Detroit Tigers for Tracy Jones.
June 19: Mario Díaz was traded by the Seattle Mariners to the New York Mets for Brian Givens.
August 29: Ken Griffey, Sr. was signed as a free agent by the Mariners.
September 18: Rick Rentería was released by the Mariners.

Ken Griffey, Sr. joined his son to become the first father and son to play in a game together. The game was played in the Kingdome against the Kansas City Royals on August 31. The Griffeys became the first father-and-son teammates to hit back-to-back home runs on September 14.

'''August 31, Kingdome, Seattle, Washington'''

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