2004 Florida Marlins season

The Florida Marlins' 2004 season was the 12th season for the Major League Baseball (MLB) franchise in the National League. It would begin with the team attempting to improve on their season from 2003, where they were the defending World Series champion, having won the World Series in six games against the New York Yankees. Their manager was Jack McKeon. They played most of their home games at Pro Player Stadium. They played two against the Montreal Expos at Chicago's U.S. Cellular Field due to Hurricane Ivan. The team started off 8–1, but then collapsed and finished with a record of 83–79, third in the National League East, and missed the playoffs.

Offseason

 * November 25, 2003: Derrek Lee was traded by the Florida Marlins to the Chicago Cubs for Hee-seop Choi and Mike Nannini (minors).
 * December 4, 2003: Matt Treanor was signed as a free agent with the Florida Marlins.

Opening Day starters

 * Juan Pierre – CF
 * Luis Castillo – 2B
 * Miguel Cabrera – RF
 * Mike Lowell – 3B
 * Jeff Conine – LF
 * Hee-Seop Choi – 1B
 * Ramón Castro – C
 * Álex González – SS
 * Josh Beckett – SP

Transactions

 * May 6, 2004: Josías Manzanillo was signed as a free agent with the Florida Marlins.
 * June 17, 2004: Billy Koch was traded by the Chicago White Sox to the Florida Marlins for Wilson Valdez and cash.
 * July 30, 2004: Paul Lo Duca was traded by the Los Angeles Dodgers with Juan Encarnación and Guillermo Mota to the Florida Marlins for Hee-seop Choi, Brad Penny, and Bill Murphy.
 * September 8, 2004: Dave Weathers was signed as a free agent with the Florida Marlins.

Starters by position
''Note: Pos = Position; G = Games played; AB = At bats; R = Runs; H = Hits; HR = Home runs; RBI = Runs batted in; Avg. = Batting average; SB = Stolen bases''

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

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

Other 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