1989 Seattle Mariners season

Offseason

• November 15, 1988: Luis DeLeón was signed as a free agent by the Mariners.
• In spring training, Ken Griffey, Jr. set preseason team records for hits, RBIs and total bases.

  Regular season

• Ken Griffey, Jr. made his major league baseball debut on opening day, April 3, against the defending league champion Oakland Athletics. Griffey hit a double in his first at-bat. During the 1989 season, Griffey was honored by being selected as card number one in the 1989 Upper Deck baseball card set.
• The Mariners had the lowest payroll in the majors in, at $7.6 million.
• Owner George Argyros sold the team in August to a group headed by Jeff Smulyan of Indianapolis.

  Season standings

Record vs. opponents

Notable transactions

• March 27: Steve Balboni was traded by the Mariners to the New York Yankees for Dana Ridenour.
• May 25: Mark Langston and a player to be named later were traded by the Mariners to the Montreal Expos for Randy Johnson, Brian Holman, and Gene Harris. The Mariners completed the deal by sending Mike Campbell to the Expos on July 31.
• June 5: Brian Turang was drafted by the Mariners in the 51st round of the 1989 amateur draft.
• June 12: Steve Trout was released by the Mariners.

  Major league debuts

• Batters:
• *Ken Griffey, Jr.
• *Omar Vizquel
• Pitchers:
• *Gene Harris
• *Clint Zavaras

  Roster

Player stats

Batting

Starters by position

Other batters

Pitching

Starting pitchers

Other pitchers

Relief pitchers

Farm system