1990 Seattle Mariners season

The 1990 Seattle Mariners season was the 14th for the Seattle Mariners in Major League Baseball (MLB). 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, most in MLB.

Offseason

November 13, 1989: Jeff Schaefer signed as a free agent with the Mariners.
December 7: Pete O'Brien signed as a free agent with the Mariners.
January 24, 1990: Jim Presley traded to the Atlanta Braves for Gary Eave and Ken Pennington.

April 1990: Ken Griffey Jr. named the American League (AL) Player of the Month after batting .388 with five home runs.
June 2: Randy Johnson threw a no-hitter versus the Detroit Tigers, the first for the franchise. He was also the tallest pitcher, at , in MLB history to throw a no-hitter. It was the 2,101st game in Mariners history. Johnson was later named the AL Pitcher of the Month for June.
July 10: Griffey Jr. and Johnson on the AL All-Star Game roster.
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. It remains the only time in MLB history that a father and son hit consecutive home runs, .
In his first full major league season, Edgar MartÃÂnez led the team with a .302 batting average.
Griffey Jr. and second baseman Harold Reynolds won AL Gold Glove Awards.

May 24, 1990: Traded Gary Eave to the San Francisco Giants for Russ Swan.
June 4: 1990 MLB draft:
Marc Newfield was selected by the Mariners in the first round (sixth pick), and he signed on June 10, receiving a $220,000 bonus.
Dave Fleming selected by the Mariners in the third round.
Bret Boone was selected by Seattle in the fifth round, and he signed on June 8.
Mike Hampton selected by the Mariners in the sixth round.
June 18: Darnell Coles was traded by the Mariners to the Detroit Tigers for Tracy Jones.
June 19: Mario DÃÂaz was traded by the Mariners to the New York Mets for Brian Givens.
August 29: Ken Griffey Sr. signed as a free agent with the Mariners.
September 18: Rick Renteria was released by the Mariners.

Ken Griffey Sr. joined his son (Ken Griffey Jr.) to become the first father and son to play in a MLB 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.

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

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