The ATP Challenger Series is the second-tier tour for professional tennis organised by the Association of Tennis Professionals (ATP). The 2004 calendar comprised 146 tournaments, with prize money ranging from $25,000 to $150,000.

Schedule January DateCountryTournamentPrizemoneySurfaceSingles championDoubles champions 05.01. São Paulo Challenger I $ 50,000 Hard Juan Mónaco Ramón Delgado André Sá 26.01. Heilbronn Open $ 100,000 Carpet (i) Gilles Elseneer Mariusz Fyrstenberg Marcin Matkowski Hilton Waikoloa Village USTA Challenger $ 50,000 Hard Dmitry Tursunov Scott Humphries Brian Vahaly

February DateCountryTournamentPrizemoneySurfaceSingles championDoubles champions 02.02. Wroclaw Challenger $ 150,000 Hard (i) Karol Beck Dominik Hrbatý Michael Kohlmann Challenger of Dallas $ 50,000 Hard (i) Sébastien de Chaunac Jordan Kerr Todd Perry Belgrade Challenger $ 25,000 Carpet (i) Nenad Zimonjić Branislav Sekáč Orest Tereshchuk Volkswagen Challenger $ 25,000 Carpet (i) Michal Tabara Robert Lindstedt Jean-Claude Scherrer 09.02. Cherbourg Challenger $ 50,000 Hard (i) Julien Jeanpierre Michal Mertiňák Alexander Waske Joplin Challenger $ 50,000 Hard (i) Lu Yen-hsun Lu Yen-hsun Bruno Soares 16.02. Challenger 42 $ 100,000 Hard (i) Julien Benneteau Yves Allegro Jean-François Bachelot 23.02. Heineken Challenger $ 50,000 Hard Arvind Parmar Rik de Voest Fred Hemmes

March DateCountryTournamentPrizemoneySurfaceSingles championDoubles champions 01.03. Besançon Challenger $ 100,000 Hard (i) Tomáš Berdych Alexander Waske Rogier Wassen Kyōto Challenger $ 25,000 Carpet (i) Michal Tabara Rik de Voest Fred Hemmes 08.03. Bogotá Challenger $ 25,000 Clay Alejandro Falla Sebastián Quintero Óscar Rodríguez Wrexham Challenger $ 25,000 Hard (i) Dennis van Scheppingen Jaroslav Levinský Alexander Waske 15.03. Mexico City Challenger $ 125,000 Clay Florian Mayer Ashley Fisher Tripp Phillips Boca Raton Challenger $ 100,000 Hard Jürgen Melzer Igor Andreev Dmitry Tursunov Sarajevo Challenger $ 25,000 Hard (i) Gilles Elseneer Jaroslav Levinský Alexander Waske 22.03. Cagliari Challenger $ 25,000 Clay Didac Pérez Tomas Behrend Giorgio Galimberti Saint-Brieuc Challenger $ 25,000 Clay (i) Olivier Mutis Christophe Rochus Tom Vanhoudt Tasmania Challenger $ 25,000 Hard Lu Yen-hsun Rik de Voest Lu Yen-hsun 29.03. Busan Challenger $ 37.500 Hard Alexander Peya Sanchai Ratiwatana Sonchat Ratiwatana Barletta Challenger $ 25,000 Clay Nicolás Almagro Marc López Fernando Vicente Canberra Challenger $ 25,000 Clay Peter Luczak Łukasz Kubot Zbynek Mlynarik Salinas Challenger $ 25,000 Hard Alejandro Falla Federico Browne Aisam-ul-Haq Qureshi

April DateCountryTournamentPrizemoneySurfaceSingles championDoubles champions 05.04. San Luis Potosí Challenger $ 50,000 Clay Mariano Delfino Tuomas Ketola Rogier Wassen Calabasas Challenger $ 25,000 Hard Ivo Karlović Ilija Bozoljac Dušan Vemić 12.04. León Challenger $ 25,000 Hard Jeff Morrison Nathan Healey Tuomas Ketola Olbia Challenger $ 25,000 Clay Stefano Pescosolido Daniele Bracciali Giorgio Galimberti 19.04. Bermuda Challenger $ 100,000 Clay Luis Horna Jordan Kerr Tom Vanhoudt Mexiko City Challenger $ 75,000 Hard Florian Mayer Ashley Fisher Tripp Phillips Barcelona Challenger $ 25,000 Clay Stan Wawrinka Emilio Benfele Álvarez Gabriel Trujillo Soler Naples Challenger $ 25,000 Clay Gilles Müller Tomas Behrend Giorgio Galimberti 26.04. Aix-en-Provence Challenger $ 125,000 Clay Fabrice Santoro Thierry Ascione Jean-François Bachelot Rome Challenger I $ 25,000 Clay Nicolas Coutelot Kornél Bardóczky Gergely Kisgyörgy

May DateCountryTournamentPrizemoneySurfaceSingles championDoubles champions 03.05. Ostrava Challenger $ 25,000 Clay Janko Tipsarević Tuomas Ketola Petr Pála 10.05. Forest Hills Challenger $ 50,000 Clay Juan Pablo Guzmán Jason Marshall Bruno Soares Zagreb Challenger $ 50,000 Clay Adrián García Karol Beck Jaroslav Levinský Košice Challenger $ 25,000 Clay Peter Luczak Devin Bowen Peter Luczak Sanremo Challenger $ 25,000 Clay Potito Starace Daniele Bracciali Giorgio Galimberti 17.05. Prague Challenger I $ 125,000 Clay Jan Hernych Karol Kučera Cyril Suk Budapest Challenger $ 25,000 Clay Stéphane Robert Juan Pablo Brzezicki Mariano Delfino Fergana Challenger $ 25,000 Hard Igor Kunitsyn Raven Klaasen Jean-Julien Rojer 24.05. Ljubljana Challenger $ 25,000 Clay Jiří Vaněk Giovanni Lapentti Rik de Voest Turin Challenger $ 25,000 Clay Álex Calatrava Leonardo Azzaro Giorgio Galimberti 31.05. Prostějov Challenger $ 125,000 Clay Radek Štěpánek Dominik Hrbatý Jaroslav Levinský Schickedanz Open $ 50,000 Clay Jiří Vaněk Adrián García Janko Tipsarević Surbiton Challenger $ 50,000 Grass Karol Beck Nathan Healey Jim Thomas Tallahassee Challenger $ 50,000 Hard Cecil Mamiit Matías Boeker Noam Okun Sassuolo Challenger $ 25,000 Clay Potito Starace Enzo Artoni Ignacio González King

June DateCountryTournamentPrizemoneySurfaceSingles championDoubles champions 07.06. Forest Hills Challenger $ 50,000 Grass Justin Gimelstob Brandon Coupe Justin Gimelstob Lugano Challenger $ 50,000 Clay Álex Calatrava Emilio Benfele Álvarez Giorgio Galimberti ATU Cup $ 25,000 Clay Tomáš Berdych Janko Tipsarević Lovro Zovko 14.06. Nord/LB Open $ 125,000 Clay Tomáš Berdych Tomas Behrend Emilio Benfele Álvarez 21.06. Andorra Challenger $ 25,000 Hard Tomáš Berdych Gilles Müller Aisam-ul-Haq Qureshi Reggio Emilia Challenger $ 25,000 Clay Olivier Mutis Tomas Behrend Tomas Tenconi 28.06. Córdoba Challenger $ 100,000 Hard Gilles Müller Brandon Coupe Tripp Phillips Mantua Challenger $ 25,000 Clay Alessio di Mauro Daniele Bracciali Giorgio Galimberti Montauban Challenger $ 25,000 Clay Álex Calatrava Marc-Kevin Goellner Álex López Morón Internationale Badische Meisterschaftenum den Techem Cup – Zell $ 25,000 Clay Daniel Elsner Jean-Claude Scherrer Alexander Waske

July DateCountryTournamentPrizemoneySurfaceSingles championDoubles champions 05.07. Scheveningen Challenger $ 50,000 Clay Peter Wessels Paul Logtens Raemon Sluiter Budaörs Challenger $ 25,000 Clay Ignacio González King Ignacio González King Gabriel Trujillo Soler Nottingham Challenger $ 25,000 Grass Jo-Wilfried Tsonga Nathan Healey Tuomas Ketola Oberstaufen Cup $ 25,000 Clay Dieter Kindlmann Vadim Davletshin Alexander Kudryavtsev San Benedetto Challenger $ 25,000 Clay Daniele Bracciali Daniele Bracciali Giorgio Galimberti 12.07. Granby Challenger $ 50,000 Hard Michael Russell Brian Baker Frank Dancevic Rimini Challenger $ 50,000 Clay Tomas Tenconi Daniele Bracciali Giorgio Galimberti São Paulo Challenger 2 $ 50,000 Hard André Sá Alejandro Hernández André Sá Manchester Challenger $ 25,000 Grass Alex Bogdanovic Jean-François Bachelot Nicolas Mahut 19.07. Hilversum Challenger $ 125,000 Clay Philipp Kohlschreiber Fred Hemmes Melle van Gemerden Aptos Challenger $ 50,000 Hard Kevin Kim Huntley Montgomery Tripp Phillips Campos Challenger $ 50,000 Hard Takao Suzuki Ricardo Mello Iván Miranda Tampere Challenger $ 50,000 Clay Boris Pašanski Andres Dellatorre Diego Moyano Valladolid Challenger $ 37.500 Hard Nicolas Mahut Jean-François Bachelot Nicolas Mahut Recanati Challenger $ 25,000 Hard Uros Vico Massimo Dell'Acqua Uros Vico 25.07. San Marino Challenger $ 100,000 Clay Potito Starace Massimo Bertolini Tom Vanhoudt Segovia Challenger $ 100,000 Hard Paul-Henri Mathieu Igor Kunitsyn Vladimir Voltchkov Lexington Challenger $ 50,000 Hard Matías Boeker Matías Boeker Amer Delić Belo Horizonte Challenger $ 25,000 Hard Janko Tipsarević Sanchai Ratiwatana Sonchat Ratiwatana Togliatti Cup $ 25,000 Hard Jo-Wilfried Tsonga Teymuraz Gabashvili Dmitry Vlasov

August DateCountryTournamentPrizemoneySurfaceSingles championDoubles champions 02.08. Poznań Challenger $ 75,000 Clay Tomáš Zíb Adam Chadaj Stéphane Robert Denver Challenger $ 50,000 Hard Brian Baker Brian Baker Rajeev Ram Trani Challenger $ 50,000 Clay Filippo Volandri Massimo Bertolini Álex López Morón Gramado Challenger $ 25,000 Hard Ricardo Mello Santiago González Bruno Soares Saransk Challenger $ 25,000 Clay Ladislav Švarc Alexey Kedryuk Vadim Kutsenko Timișoara Challenger $ 25,000 Clay Marc Gicquel Florin Mergea Horia Tecău 09.08. Binghamton Professional Tennis Tournament $ 50,000 Hard Noam Okun Huntley Montgomery Tripp Phillips Cordenons Challenger $ 25,000 Clay Daniel Gimeno Traver Leonardo Azzaro Kornél Bardóczky Graz Challenger $ 25,000 Hard Jan Minář Julian Knowle Alexander Peya Manta Challenger $ 25,000 Hard Giovanni Lapentti Marcos Daniel Santiago González St. Petersburg Challenger $ 25,000 Clay Jean-René Lisnard Mikhail Elgin Andrei Mishin 16.08. Bronx Challenger $ 50,000 Hard Julien Jeanpierre Huntley Montgomery Tripp Phillips Geneva Challenger $ 37.500 Clay Stan Wawrinka Tomáš Cibulec David Škoch Deutsche Vermögensberatung Challenger Open $ 25,000 Clay Tobias Summerer Philipp Petzschner Christopher Kas Samarkand Challenger $ 25,000 Clay Mariano Puerta Jean-François Bachelot Melle van Gemerden 23.08. Manerbio Challenger $ 50,000 Clay Nicolás Almagro Petr Luxa Martin Štěpánek Bukhara Challenger $ 25,000 Hard Michal Mertiňák Michal Mertiňák Pavel Šnobel 30.08. Kyiv Challenger $ 50,000 Clay Nicolás Almagro Albert Portas Sergio Roitman Black Forest Open $ 25,000 Clay Santiago Ventura Gabriel Trifu Alexander Waske

September DateCountryTournamentPrizemoneySurfaceSingles championDoubles champions 06.09. Istanbul Challenger $ 75,000 Hard Peter Wessels George Bastl Björn Phau Seoul Challenger $ 75,000 Hard Lee Hyung-taik Ashley Fisher Robert Lindstedt Donezk Challenger $ 50,000 Hard Marco Chiudinelli Igor Kunitsyn Uros Vico Rhein-Main Challenger $ 25,000 Clay Leonardo Azzaro Ota Fukárek Jan Vacek Brașov Challenger $ 25,000 Clay Victor Ioniță Salvador Navarro Rubén Ramírez Hidalgo Genova Challenger $ 25,000 Clay Juan Antonio Marín Emilio Benfele Álvarez Álex López Morón 13.09. Budapest Challenger $ 25,000 Clay Stéphane Robert Juan Pablo Brzezicki Mariano Delfino Tehran Challenger $ 25,000 Clay Mariano Puerta Oliver Marach Jean-Claude Scherrer 20.09. Szczecin Challenger $ 125,000 Clay Edgardo Massa Lucas Arnold Ker Mariano Hood Covington Challenger $ 50,000 Hard Paul Goldstein Paul Goldstein K. J. Hippensteel Banja Luka Challenger $ 25,000 Clay Yuri Schukin Not completed Beijing Challenger $ 25,000 Hard Justin Gimelstob Ashley Fisher Tripp Phillips 27.09. Grenoble Challenger $ 75,000 Hard (i) Karol Kučera Uros Vico Lovro Zovko College Station Challenger $ 25,000 Hard André Sá Paul Goldstein Brian Vahaly Dubrovnik Challenger $ 25,000 Clay Edgardo Massa Juan Pablo Brzezicki Martín Vassallo Argüello

October DateCountryTournamentPrizemoneySurfaceSingles championDoubles champions 04.10. Austin Challenger $ 50,000 Hard Robert Kendrick André Sá Bruno Soares Seville Challenger $ 37.500 Clay Óscar Hernández Tomas Behrend Alexander Waske Quito Challenger $ 25,000 Clay Giovanni Lapentti Santiago González Alejandro Hernández Rome Challenger II $ 25,000 Clay Nicolas Coutelot Kornél Bardóczky Gergely Kisgyörgy 11.10. Tiburon Challenger $ 50,000 Hard K. J. Hippensteel André Sá Bruno Soares Barcelona Challenger $ 25,000 Clay Stan Wawrinka Emilio Benfele Álvarez Gabriel Trujillo Soler 18.10. Bolton Challenger $ 25,000 Hard (i) Marcos Baghdatis Jeff Coetzee Jim Thomas Burbank Challenger $ 25,000 Hard Kevin Kim Nick Rainey Brian Wilson

November