The Seattle Mariners 1988 season was their 12th since the franchise creation, and ended the season finishing 7th in the American League West, finishing with a record of 68-93.
December 9, 1987: Phil Bradley and Tim Fortugno were traded by the Mariners to the Philadelphia Phillies for Glenn Wilson, Mike Jackson, and Dave Brundage (minors).
December 21, 1987: John Moses was released by the Mariners.
December 22, 1987: Lee Guetterman, Clay Parker, and Wade Taylor were traded by the Mariners to the New York Yankees for Steve Trout and Henry Cotto.
January 19, 1988: John Rabb was signed as a free agent by the Mariners.
Mark Langston became the ace of the pitching staff as he led the club in wins (15) and strikeouts (235).
Mickey Brantley
Alvin Davis
Mike Kingery
Ken Phelps
Jim Presley
Rey Quiñones
Harold Reynolds
Steve Trout
Dave Valle
Glenn Wilson
May 23, 1988: John Christensen was released by the Mariners.
June 1, 1988: Steve Balboni was signed as a free agent by the Mariners.
June 1, 1988: Greg Pirkl was drafted by the Mariners in the 2nd round of the 1988 Major League Baseball Draft. Player signed June 6, 1988.
July 21, 1988: Ken Phelps was traded by the Mariners to the New York Yankees for Jay Buhner, Rich Balabon (minors) and a player to be named later. The Yankees completed the deal by sending Troy Evers (minors) to the Mariners on October 12.
July 22, 1988: Glenn Wilson was traded by the Mariners to the Pittsburgh Pirates for Darnell Coles.
July 24, 1998: Joe Oliver was signed as a free agent by the Mariners.
Batters:
Greg Briley (June 27)
Bill McGuire (Aug 2)
Pitchers:
Erik Hanson (Sep 5)
Mike Schooler (June 10)
Terry Taylor (Aug 19)
Note: Pos = position; G = Games played; AB = At Bats; H = Hits; Avg. = Batting Average; HR = Home Runs; RBI = Runs Batted In
AZL club affiliation shared with Boston Red Sox
