2004 Arizona Diamondbacks season

The 2004 Arizona Diamondbacks season was the franchise's 7th season in Major League Baseball and their 7th season at Bank One Ballpark in Phoenix, Arizona, as members of the National League West.
They looked to improve on their 84–78 record from 2003. The Diamondbacks hoped to contend for a postseason berth in what was a weaker National League West than in years past. However, just three years after winning a World Series title, the Diamondbacks instead finished the season with a record of 51–111, the worst record by any National League team since the 1965 Mets won one fewer game. This was the Diamondbacks' first losing season since 1998. The one highlight of a disastrous season was when Randy Johnson pitched a perfect game on May 18, 2004. The franchise record would not be threatened until 2021, when they finished 52–110. Despite the 110-loss season in 2021, the Diamondbacks didn't earn the first overall pick in the 2022 MLB Draft, as the Baltimore Orioles finished with a 52–110 record, but were worse due to records against American League opponents.

Offseason

November 28, 2003: Curt Schilling was traded by the Diamondbacks to the Boston Red Sox for Casey Fossum, Brandon Lyon, Jorge de la Rosa, and Michael Goss.
November 29, 2003: Jesse Orosco was signed as a free agent with the Diamondbacks.
December 1, 2003: Lyle Overbay, Chris Capuano, Craig Counsell, Chad Moeller, Jorge de la Rosa, and Junior Spivey were traded by the Diamondbacks to the Milwaukee Brewers for Richie Sexson, Shane Nance and a player to be named later. The Brewers completed the deal by sending Noochie Varner to the Diamondbacks on December 15.
December 4, 2003: Félix José was signed as a free agent by the Diamondbacks.
December 15, 2003: Quinton McCracken was traded by the Diamondbacks to the Seattle Mariners for Greg Colbrunn and cash.
December 18, 2003: Brent Mayne was signed as a free agent by the Diamondbacks.
February 25, 2004: Bobby Estalella was signed as a free agent by the Diamondbacks.
February 25, 2004: Scott Service was signed as a free agent by the Diamondbacks.

June 11, 2004: Quinton McCracken was signed as a free agent by the Diamondbacks.
July 31, 2004: Steve Finley and Brent Mayne were traded by the Diamondbacks to the Los Angeles Dodgers in exchange for Reggie Abercrombie, Koyie Hill and Bill Murphy.
August 19, 2004: Elmer Dessens was traded by the Diamondbacks to the Los Angeles Dodgers in exchange for Jereme Milons.

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; GS = Games started; 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