The Seattle Mariners 2003 season was their 27th since the franchise creation. The team finished second in the American League West with a record of 93–69. The team used only five starting pitchers the entire season, which was unusual. The five starting pitchers were Ryan Franklin, Freddy Garcia, Gil Meche, Jamie Moyer and Joel Piñeiro.

Offseason

Regular season

Opening Day starters

Season standings

Record vs. opponents

Notable transactions

Roster

Player stats

Batting

Starters by position

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

Other batters

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

Pitching

Starting pitchers

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

Relief pitchers

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

Awards and honors

2003 Major League Baseball All-Star Game

Farm system

LEAGUE CHAMPIONS: San Antonio, Inland Empire

Major League Baseball Draft

The following is a list of 2003 Seattle Mariners draft picks. The Mariners took part in both the Rule 4 draft (June amateur draft) and the Rule 5 draft. The Mariners made 53 selections in the 2003 draft, the first being shortstop Adam Jones in the first round. In all, the Mariners selected 30 pitchers, 8 outfielders, 6 catchers, 4 shortstops, 4 third basemen, and 1 first baseman.

Draft

Key

Table

Rule 5 draft

Key

Table