The ATP Challenger Series is the second tier tour for professional tennis organised by the Association of Tennis Professionals (ATP). The 2005 ATP Challenger Series calendar comprised 150 tournaments, with prize money ranging from $25,000 up to $150,000.^[1][2]

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
03.01.	New Caledonia	Nouméa Challenger	$ 075,000	Hard	Gilles Simon	Stephen Huss Wesley Moodie
	Brazil	São Paulo Challenger	$ 075,000	Hard	Ricardo Mello	André Sá Bruno Soares
17.01.	Chile	La Serena Challenger	$ 050,000	Clay	Edgardo Massa	Enzo Artoni Ramón Delgado
24.01.	Germany	Heilbronn Open	$ 100,000	Carpet (i)	Jiří Vaněk	Sébastien de Chaunac Michal Mertiňák
	United States	Hilton Waikoloa Village USTA Challenger	$ 050,000	Hard	Paul Goldstein	André Sá Eric Taino
	Chile	Santiago Challenger	$ 025,000	Clay	Tomas Behrend	Giovanni Lapentti Damián Patriarca
	Great Britain	Wrexham Challenger	$ 025,000	Hard (i)	Vladimir Voltchkov	Mark Hilton Jonathan Marray
31.01.	France	Challenger 42	$ 100,000	Hard (i)	Thierry Ascione	Nicolas Thomann Alexander Waske
	Poland	Breslau Challenger	$ 075,000	Hard (i)	Robin Vik	Lukáš Dlouhý Martin Štěpánek
	Germany	Volkswagen Challenger	$ 025,000	Carpet (i)	Dieter Kindlmann	Philipp Petzschner Alexander Peya

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
07.02.	Serbia	Belgrad Challenger	$ 050,000	Carpet (i)	Dick Norman	Igor Kunitsyn Orest Tereshchuk
	United States	Challenger of Dallas	$ 050,000	Hard (i)	Michael Ryderstedt	Rik de Voest Giovanni Lapentti
	Australia	Burnie Challenger	$ 025,000	Hard	Chris Guccione	Luke Bourgeois Chris Guccione
14.02.	France	Besançon Challenger	$ 100,000	Hard (i)	Gaël Monfils	Jason Marshall Huntley Montgomery
	United States	Joplin Challenger	$ 050,000	Hard (i)	Frédéric Niemeyer	Rik de Voest Łukasz Kubot
21.02.	France	Cherbourg Challenger	$ 050,000	Hard (i)	Rik de Voest	Sanchai Ratiwatana Sonchat Ratiwatana
	Germany	Logopark ATP Challenger	$ 025,000	Carpet (i)	Raemon Sluiter	Martin Štěpánek Pavel Šnobel

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
07.03.	Japan	Kyōto Challenger	$ 025,000	Carpet (i)	Robin Vik	Pavel Šnobel Michal Tabara
14.03.	United States	Sunrise Challenger	$ 100,000	Hard	Karol Beck	Rick Leach Travis Parrott
	Vietnam	Heineken Challenger	$ 050,000	Hard	Jimmy Wang	Cecil Mamiit Eric Taino
	Ecuador	Salinas Challenger	$ 025,000	Hard	Dennis van Scheppingen	Juan Pablo Brzezicki Cristian Villagrán
	Bosnia and Herzegovina	Sarajevo Challenger	$ 025,000	Hard (i)	Vladimir Voltchkov	Michal Mertiňák Sergiy Stakhovsky
21.03.	Mexico	San Luis Potosí Challenger	$ 050,000	Clay	Fernando Vicente	Łukasz Kubot Oliver Marach
	Italy	Barletta Challenger	$ 025,000	Clay	Richard Gasquet	Tom Vanhoudt Kristof Vliegen
	France	Saint Brieuc Challenger	$ 025,000	Clay (i)	Olivier Patience	Victor Ioniță Gabriel Moraru
28.03.	Italy	Neapel Challenger	$ 100,000	Clay	Richard Gasquet	Janko Tipsarević Jiří Vaněk
	Mexico	León Challenger	$ 025,000	Hard	Amer Delić	Rajeev Ram Bobby Reynolds

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
04.04.	Mexico	Mexiko-Stadt Challenger	$ 125,000	Clay	Florent Serra	Lukáš Dlouhý Pavel Šnobel
	United States	Tallahassee Challenger	$ 050,000	Hard	Brian Vahaly	Robert Lindstedt Alexander Peya
	Australia	Canberra Challenger	$ 025,000	Clay	Chris Guccione	Richard Fromberg Chris Guccione
11.04.	Bermuda	Bermuda Challenger	$ 025,000	Clay	Tomáš Zíb	Jordan Kerr Sebastián Prieto
	Mexico	León Challenger II	$ 025,000	Hard	Jo-Wilfried Tsonga	Jeff Coetzee Mark Merklein
	Italy	Olbia Challenger	$ 025,000	Clay	Tomas Behrend	Massimo Bertolini Uros Vico
18.04.	Colombia	Bogotá Challenger	$ 025,000	Clay	Marcos Daniel	Brian Dabul Marcelo Melo
	Italy	Monza Challenger	$ 025,000	Clay	Alessio di Mauro	Nicolas Devilder Olivier Patience
	Great Britain	Nottingham Challenger I	$ 025,000	Hard	Robin Vik	Mark Hilton Jonathan Marray
25.04.	Tunisia	Tunis Challenger	$ 125,000	Clay	Gaël Monfils	Tomas Behrend Robert Lindstedt
	Italy	Rom Challenger	$ 025,000	Clay	Olivier Patience	Manuel Jorquera Dmitry Tursunov

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
02.05.	United States	Tunica Resorts Challenger	$ 050,000	Clay (i)	James Blake	Michael Russell Dušan Vemić
	Czech Republic	Ostrava Challenger	$ 025,000	Clay	Lukáš Dlouhý	Pavel Šnobel Martin Štěpánek
09.05.	Czech Republic	Prague Challenger	$ 100,000	Clay	Jan Hernych	Jordan Kerr Sebastián Prieto
	United States	Forest Hills Challenger I	$ 050,000	Clay	James Blake	Nathan Healey Mark Merklein
	Italy	Sanremo Challenger	$ 025,000	Clay	Novak Djokovic	Francesco Aldi Tomas Tenconi
16.05.	Croatia	Zagreb Challenger	$ 050,000	Clay	Ivan Ljubičić	Gabriel Trifu Tom Vanhoudt
	Hungary	Budapest Challenger I	$ 025,000	Clay	Răzvan Sabău	Stephen Huss Johan Landsberg
	Germany	Ostdeutscher Sparkassen Cup	$ 025,000	Clay	Vasilis Mazarakis	Christopher Kas Philipp Petzschner
	Uzbekistan	Fergana Challenger	$ 025,000	Hard	Lu Yen-hsun	Murad Inoyatov Denis Istomin
23.05.	South Korea	Busan Challenger	$ 050,000	Hard	Danai Udomchoke	Paul Goldstein Rajeev Ram
	Germany	Ettlingen Challenger	$ 025,000	Clay	Adrián García	Marc López Albert Portas
	Slovenia	Ljubljana Challenger	$ 025,000	Clay	Rubén Ramírez Hidalgo	Paul Baccanello Lovro Zovko
	Italy	Turin Challenger	$ 025,000	Clay	Carlos Berlocq	Franco Ferreiro Sergio Roitman
30.05.	Czech Republic	Prostějov Challenger	$ 125,000	Clay	Jarkko Nieminen	Lukáš Dlouhý David Škoch
	Germany	Schickedanz Open	$ 050,000	Clay	Albert Portas	Amir Hadad Harel Levy
	Great Britain	Surbiton Challenger	$ 050,000	Grass	Daniele Bracciali	Jordan Kerr Jim Thomas
	United States	Yuba City Challenger	$ 050,000	Hard	Cecil Mamiit	Brandon Coupe Justin Gimelstob
	Italy	Sassuolo Challenger	$ 025,000	Clay	Oliver Marach	Juan Pablo Brzezicki Cristian Villagrán

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
06.06.	Switzerland	Lugano Challenger	$ 075,000	Clay	Albert Montañés	Enzo Artoni Juan Pablo Brzezicki
	Spain	Barcelona Challenger	$ 025,000	Clay	Sergio Roitman	Óscar Hernández Gabriel Trujillo Soler
	Slovakia	Košice Challenger	$ 025,000	Clay	Răzvan Sabău	Petr Luxa Igor Zelenay
13.06.	Germany	Nord/LB Open	$ 125,000	Clay	Óscar Hernández	Enzo Artoni Álex López Morón
	Ecuador	Cuenca Challenger	$ 025,000	Clay	Zack Fleishman	Goran Dragicevic Mirko Pehar
20.06.	Italy	Reggio nell’Emilia Challenger	$ 025,000	Clay	Thierry Ascione	Irakli Labadze Yuri Schukin
27.06.	Italy	Biella Challenger	$ 100,000	Clay	Irakli Labadze	Gabriel Trifu Tom Vanhoudt
	Spain	Córdoba Challenger	$ 100,000	Hard	Marcos Baghdatis	Vladimir Voltchkov Sergiy Stakhovsky
	United States	Forest Hills Challenger II	$ 050,000	Grass	Frédéric Niemeyer	Richard Barker Huntley Montgomery
	France	Montauban Challenger	$ 025,000	Clay	Édouard Roger-Vasselin	Steve Darcis Stefan Wauters

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
04.07.	Netherlands	Scheveningen Challenger	$ 050,000	Clay	Melle van Gemerden	Julien Benneteau Édouard Roger-Vasselin
	Hungary	Budaörs Challenger	$ 025,000	Clay	Boris Pašanski	Amir Hadad Harel Levy
	Italy	Mantua Challenger	$ 025,000	Clay	Giorgio Galimberti	Flavio Cipolla Alessandro Motti
	Great Britain	Nottingham Challenger II	$ 025,000	Grass	Alex Bogdanovic	Josh Goodall Martin Lee
	Germany	Oberstaufen Cup	$ 025,000	Clay	Simon Greul	Oliver Marach Jean-Claude Scherrer
11.07.	United States	Aptos Challenger	$ 075,000	Hard	Andy Murray	Nathan Healey Eric Taino
	Italy	Rimini Challenger	$ 050,000	Clay	Florent Serra	David Škoch Martin Štěpánek
	Great Britain	Manchester Challenger	$ 025,000	Grass	Daniele Bracciali	Mark Hilton Jonathan Marray
18.07.	Colombia	Bogotá Challenger	$ 050,000	Clay	Marcos Daniel	Brian Dabul Marcelo Melo
	Finland	Tampere Challenger	$ 050,000	Clay	Boris Pašanski	Marc Gicquel Édouard Roger-Vasselin
	United States	Tarzana Challenger	$ 050,000	Hard	Alex Bogomolov Jr.	Alex Bogomolov Jr. Travis Rettenmaier
25.07.	Poland	Posen Challenger	$ 100,000	Clay	Teymuraz Gabashvili	Łukasz Kubot Filip Urban
	Brazil	Campos do Jordão Challenger	$ 050,000	Hard	André Sá	Kristian Pless Alex Vlaški
	Canada	Granby Challenger	$ 050,000	Hard	Danai Udomchoke	Johan Landsberg Lu Yen-hsun
	United States	Lexington Challenger	$ 050,000	Hard	Dudi Sela	Scoville Jenkins Bobby Reynolds
	Spain	Valladolid Challenger	$ 037.500	Hard	Filip Prpic	Matwé Middelkoop Alexander Peya
	Italy	Recanati Challenger	$ 025,000	Hard	Davide Sanguinetti	Uros Vico Lovro Zovko
	Russia	Togliatti Cup	$ 025,000	Hard	Igor Kunitsyn	Scott Lipsky Mark Nielsen

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
01.08.	Spain	Segovia Challenger	$ 100,000	Hard	Michael Berrer	Marcel Granollers Álex López Morón
	Canada	Vancouver Challenger	$ 100,000	Hard	Dudi Sela	Ashley Fisher Tripp Phillips
	Italy	Trani Challenger	$ 050,000	Clay	Lukáš Dlouhý	Carlos Berlocq Cristian Villagrán
	Brazil	Belo Horizonte Challenger	$ 025,000	Hard	John Paul Fruttero	Lesley Joseph Alex Vlaški
	Russia	Saransk Challenger	$ 025,000	Clay	Igor Kunitsyn	Flavio Cipolla Simon Stadler
	Romania	Timișoara Challenger	$ 025,000	Clay	Jean-Christophe Faurel	Ionuț Moldovan Gabriel Moraru
08.08.	San Marino	San Marino Challenger	$ 100,000	Clay	Juan Antonio Marín	Lukáš Dlouhý David Škoch
	Great Britain	DBI Tennis Challenger	$ 050,000	Hard	Andy Murray	Huntley Montgomery Tripp Phillips
	Spain	Pamplona Challenger	$ 037.500	Hard	Nicolas Devilder	Aisam-ul-Haq Qureshi Lovro Zovko
	Brazil	Gramado Challenger	$ 025,000	Hard	Flávio Saretta	Goran Dragicevic Mirko Pehar
	Austria	Graz Challenger	$ 025,000	Hard	Robin Vik	Julian Knowle Alexander Peya
15.08.	United States	Bronx Challenger	$ 050,000	Hard	Thierry Ascione	Cecil Mamiit Brian Vahaly
	France	Cordenons Challenger	$ 050,000	Clay	Carlos Berlocq	Not completed
	Spain	Vigo Challenger	$ 037.500	Clay	Albert Portas	Lars Uebel Jan Vacek
	Colombia	Manta Challenger	$ 025,000	Hard	Thiago Alves	Brian Dabul Marcel Felder
	Uzbekistan	Samarkand Challenger	$ 025,000	Clay	Boris Pašanski	Ivan Cerović Petar Popović
22.08.	Italy	Manerbio Challenger	$ 050,000	Clay	Oliver Marach	Melle van Gemerden Rogier Wassen
	Switzerland	Genf Challenger	$ 037.500	Clay	Werner Eschauer	Rubén Ramírez Hidalgo Santiago Ventura'
	Uzbekistan	Bukhara Challenger	$ 025,000	Hard	Denis Istomin	Alexey Kedryuk Orest Tereshchuk
29.08.	Ukraine	Kiew Challenger	$ 050,000	Clay	Daniel Köllerer	Diego Junqueira Martín Vassallo Argüello
	Germany	Black Forest Open	$ 025,000	Clay	Sergio Roitman	Pavel Šnobel Martin Štěpánek

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
05.09.	Turkey	Istanbul Challenger	$ 075,000	Hard	Jimmy Wang	Harel Levy Noam Okun
	Romania	Brașov Challenger	$ 025,000	Clay	Daniel Elsner	Ionuț Moldovan Gabriel Moraru
	Ukraine	Donetzk Challenger	$ 025,000	Hard	Łukasz Kubot	Mikhail Filima Orest Tereshchuk
	Italy	Genua Challenger	$ 025,000	Clay	Potito Starace	Leonardo Azzaro Sergio Roitman
12.09.	France	Orléans Challenger	$ 075,000	Hard (i)	Cyril Saulnier	Julien Benneteau Nicolas Mahut
	Spain	Sevilla Challenger	$ 037.500	Clay	Marco Mirnegg	Marcos Daniel Fernando Vicente
	Hungary	Budapest Challenger II	$ 025,000	Clay	Boris Pašanski	Leonardo Azzaro Sergio Roitman
19.09.	Poland	Stettin Challenger	$ 125,000	Clay	Agustín Calleri	Mariusz Fyrstenberg Marcin Matkowski
	United States	Lubbock Challenger	$ 050,000	Hard	Ramón Delgado	Hugo Armando Glenn Weiner
	Bosnia and Herzegovina	Banja Luka Challenger	$ 025,000	Clay	Vasilis Mazarakis	Flavio Cipolla Rainer Eitzinger
26.09.	France	Grenoble Challenger	$ 075,000	Hard (i)	Marc Gicquel	Julien Benneteau Nicolas Mahut
	United States	Tulsa Challenger	$ 050,000	Hard	Harel Levy	Scott Lipsky David Martin

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
03.10.	France	Mons Challenger	$ 125,000	Carpet (i)	Olivier Rochus	Christopher Kas Philipp Petzschner
	Italy	Rom Challenger	$ 025,000	Clay	Olivier Patience	Manuel Jorquera Dmitry Tursunov
10.10.	United States	Sacramento Challenger	$ 050,000	Hard	Rik de Voest	Scott Lipsky David Martin
	Spain	Barcelona Challenger	$ 025,000	Clay	Sergio Roitman	Óscar Hernández Gabriel Trujillo Soler
	Ecuador	Quito Challenger	$ 025,000	Clay	Thiago Alves	Hugo Armando Glenn Weiner
17.10.	Colombia	Bogotá Challenger	$ 050,000	Clay	Marcos Daniel	Brian Dabul Marcelo Melo
	United States	Calabasas Challenger	$ 050,000	Hard	Brian Vahaly	Amer Delic Bobby Reynolds
	Denmark	Kolding Challenger	$ 050,000	Carpet (i)	Dmitry Tursunov	Stephen Huss Johan Landsberg
	Great Britain	Southampton Challenger	$ 025,000	Hard (i)	Jérôme Haehnel	Jeff Coetzee Rogier Wassen
24.10.	South Korea	Seoul Challenger	$ 100,000	Hard	Lee Hyung-taik	Alexander Peya Björn Phau
	United States	Carson Challenger	$ 050,000	Hard	Justin Gimelstob	Goran Dragicevic Jan-Michael Gambill
	Chile	Santiago Challenger	$ 050,000	Clay	Tomas Behrend	Giovanni Lapentti Damián Patriarca
31.10.	United States	Boston Challenger	$ 075,000	Hard (i)	Paul Goldstein	Ramón Delgado André Sá
	Germany	Lambertz Open by STAWAG	$ 050,000	Carpet (i)	Evgeny Korolev	James Auckland Jamie Delgado
	South Korea	Busan Challenger	$ 050,000	Hard	Danai Udomchoke	Paul Goldstein Rajeev Ram
	Uruguay	Montevideo Challenger	$ 050,000	Clay	Juan Martín del Potro	Brian Dabul Damián Patriarca
	Australia	Caloundra Challenger	$ 025,000	Hard	Peter Luczak	Peter Luczak Shannon Nettle

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
07.11.	Slovakia	Bratislava Challenger	$ 100,000	Hard (i)	Dominik Hrbatý	Chris Haggard Jean-Claude Scherrer
	United States	Nashville Challenger	$ 075,000	Hard (i)	Bobby Reynolds	Ilija Bozoljac Brian Wilson
	Colombia	Guayaquil Challenger	$ 050,000	Clay	Marcos Daniel	Juan Martín del Potro Juan Antonio Marín
	Germany	Bauer Watertechnology Cup	$ 025,000	Carpet (i)	Michael Berrer	Christopher Kas Philipp Petzschner
14.11.	Ukraine	Dnipro Challenger	$ 125,000	Hard (i)	Dick Norman	Lukáš Dlouhý David Škoch
	Brazil	Aracaju Challenger	$ 100,000	Clay	Boris Pašanski	Máximo González Sergio Roitman
	France	Champaign Challenger	$ 050,000	Hard (i)	Danai Udomchoke	Ashley Fisher Tripp Phillips
	Finland	Helsinki Challenger	$ 050,000	Hard (i)	Björn Rehnquist	Yves Allegro Michael Kohlmann
	Mexico	Puebla Challenger	$ 025,000	Hard	Hugo Armando	Werner Eschauer Alexander Satschko
21.11.	Luxembourg	Luxemburg Challenger	$ 150,000	Hard (i)	Christophe Rochus	Eric Butorac Chris Drake
	Argentina	Buenos Aires Challenger	$ 100,000	Clay	Carlos Berlocq	Lucas Arnold Ker Sebastián Prieto
	Czech Republic	Prague Challenger	$ 025,000	Carpet (i)	Raemon Sluiter	Filip Polášek Sergiy Stakhovsky
	Réunion	La Réunion Challenger	$ 025,000	Hard	Philipp Kohlschreiber	Teymuraz Gabashvili Stéphane Robert
	Great Britain	Sunderland Challenger	$ 025,000	Hard (i)	Alex Bogdanovic	Frank Moser Sebastian Rieschick
28.11.	United States	Orlando Challenger	$ 050,000	Hard	Michael Russell	Ashley Fisher Tripp Phillips

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
26.12.	Qatar	Doha Challenger	$ 050,000	Hard	Olivier Patience	Łukasz Kubot Oliver Marach