The ATP Challenger Series is the second tier tour for professional tennis organised by the Association of Tennis Professionals (ATP). The 2006 ATP Challenger Series calendar comprised 161 tournaments, with prize money ranging from $25,000 up to $125,000.^[1][2]

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
02.01.	Brazil	São Paulo Challenger	$ 100,000	Hard	Flávio Saretta	Thiago Alves Flávio Saretta
	New Caledonia	Nouméa Challenger	$ 075,000	Hard	Gilles Simon	Alex Bogomolov Jr. Todd Widom
23.01.	Germany	Heilbronn Open	$ 100,000	Carpet (i)	Robin Söderling	Christopher Kas Philipp Petzschner
	United States	Hilton Waikoloa Village USTA Challenger	$ 050,000	Hard	Frank Dancevic	Michael Kohlmann Cecil Mamiit
	Chile	Santiago de Chile Challenger	$ 025,000	Clay	Boris Pašanski	Máximo González Sergio Roitman
	Great Britain	Wrexham Challenger	$ 025,000	Hard (i)	Alex Bogdanovic	Jean-François Bachelot Stéphane Robert
30.01.	France	Andrezieux Challenger	$ 100,000	Hard (i)	Gilles Elseneer	Julien Benneteau Nicolas Mahut
	Brazil	Florianópolis Challenger	$ 025,000	Clay	Ricardo Mello	Máximo González Sergio Roitman

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
06.02.	Poland	Breslau Challenger	$ 125,000	Hard (i)	Lukáš Dlouhý	Mariusz Fyrstenberg Marcin Matkowski
	Italy	Bergamo Challenger I	$ 050,000	Carpet (i)	Alex Bogdanovic	Daniele Bracciali Giorgio Galimberti
	United States	Challenger of Dallas	$ 050,000	Hard (i)	Kevin Kim	Rajeev Ram Bobby Reynolds
	Australia	Burnie Challenger	$ 025,000	Hard	Konstantinos Economidis	Luke Bourgeois Lu Yen-hsun
13.02.	Serbia	Belgrad Challenger	$ 100,000	Carpet (i)	Janko Tipsarević	Michael Kohlmann Alexander Waske
	United States	Joplin Challenger	$ 050,000	Hard (i)	Jesse Witten	Henry Adjei-Darko Lesley Joseph
20.02.	France	Besançon Challenger	$ 100,000	Hard (i)	Nicolas Mahut	Christopher Kas Philipp Petzschner
27.02.	France	Cherbourg Challenger	$ 050,000	Hard (i)	Nicolas Mahut	Jean-François Bachelot Stéphane Robert
	Germany	Volkswagen Challenger	$ 025,000	Carpet (i)	Alexander Waske	Jean-Claude Scherrer Uros Vico

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
06.03.	Japan	Kyōto Challenger	$ 025,000	Carpet (i)	Nicolas Mahut	Alun Jones Jonathan Marray
13.03.	United States	Sunrise Challenger	$ 100,000	Hard	Dmitry Tursunov	Petr Pála Robin Vik
	Vietnam	HTV Challenger Romano Cup	$ 050,000	Hard	Zack Fleishman	Lee Hyung-taik Cecil Mamiit
	Ecuador	Salinas Challenger	$ 025,000	Hard	Benjamin Becker	Thiago Alves Júlio Silva
	Bosnia and Herzegovina	Sarajevo Challenger	$ 025,000	Hard (i)	Andreas Beck	Ilija Bozoljac Viktor Troicki
20.03.	Italy	Barletta Challenger	$ 025,000	Clay	Jan Hájek	Santiago Ventura Fernando Vicente
27.03.	Mexico	Mexiko-Stadt Challenger	$ 125,000	Clay	Ramón Delgado	Tripp Phillips Rogier Wassen
	Italy	Naples Challenger	$ 100,000	Clay	Potito Starace	Tomáš Cibulec Łukasz Kubot
	France	St. Brieuc Challenger	$ 025,000	Clay (i)	Marc Gicquel	Eric Butorac Chris Drake

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
03.04.	United States	Tallahassee Challenger	$ 050,000	Hard	Mardy Fish	Rik de Voest Glenn Weiner
	Mexico	Aguascalientes Challenger	$ 025,000	Clay	Juan Martín del Potro	Juan Martín del Potro Martín Vassallo Argüello
	Italy	Monza Challenger	$ 025,000	Clay	Nicolas Devilder	Rubén Ramírez Hidalgo Tomas Tenconi
10.04.	Brazil	Florianopolis Challenger	$ 100,000	Clay	Diego Junqueira	Cristian Villagrán Juan Pablo Brzezicki
	Mexico	San Luis Potosí Challenger	$ 050,000	Clay	Rainer Eitzinger	Daniel Garza Dawid Olejniczak
	United States	Valencia Challenger	$ 050,000	Hard	Frédéric Niemeyer	John Paul Fruttero Sam Warburg
17.04.	Bermuda	Bermuda Challenger	$ 100,000	Clay	Fernando Vicente	Tomáš Cibulec Robert Lindstedt
	Great Britain	Cardiff Challenger	$ 025,000	Hard (i)	Jan Vacek	Philipp Petzschner Alexander Peya
	Switzerland	Chiasso Challenger	$ 025,000	Clay	Werner Eschauer	Leonardo Azzaro Lovro Zovko
	India	Chikmagalur Challenger	$ 025,000	Hard	Danai Udomchoke	Sanchai Ratiwatana Sonchat Ratiwatana
	Mexico	León Challenger I	$ 025,000	Hard	Phillip Simmonds	Juan Manuel Elizondo Miguel Gallardo Valles
24.04.	Colombia	Bogotá Challenger	$ 100,000	Clay	Alejandro Falla	Eric Butorac Chris Drake
	Italy	Bergamo Challenger II	$ 025,000	Clay	Nicolas Devilder	Jan Hájek Jaroslav Pospíšil
	India	PVG Open	$ 025,000	Hard	Viktor Troicki	Kamil Čapkovič Lukáš Lacko
	Spain	Lanzarote Challenger	$ 025,000	Hard	Filip Prpic	Grégory Carraz Jean-Michel Pequery
	Mexico	León Challenger II	$ 025,000	Hard	Rik de Voest	Pierre-Ludovic Duclos André Ghem

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
01.05.	Tunisia	Tunis Challenger	$ 125,000	Clay	Lamine Ouahab	Daniel Gimeno Traver Iván Navarro
	United States	Atlanta Challenger	$ 025,000	Clay	Diego Hartfield	Hugo Armando André Sá
	Czech Republic	Ostrava Challenger	$ 025,000	Clay	Ivo Minář	Jaroslav Pospíšil Pavel Šnobel
	Italy	Rome Challenger	$ 025,000	Clay	Oliver Marach	Konstantinos Economidis Amir Hadad
	Spain	Telde Challenger	$ 025,000	Clay	Marc López	Adam Chadaj Michael Ryderstedt
08.05.	Czech Republic	Prague Challenger	$ 100,000	Clay	Robin Vik	Petr Pála David Škoch
	United States	Tunica Resorts Challenger	$ 050,000	Clay (i)	Diego Hartfield	Jeff Morrison Bobby Reynolds
	Germany	Ostdeutscher Sparkassen Cup	$ 025,000	Clay	Simon Greul	Yves Allegro Michal Mertiňák
15.05.	United States	Forest Hills Challenger	$ 050,000	Clay	Robert Kendrick	Chris Drake Cecil Mamiit
	Croatia	Zagreb Challenger	$ 050,000	Clay	Daniel Elsner	Yves Allegro Michal Mertiňák
	Uzbekistan	Fergana Challenger	$ 025,000	Hard	Danai Udomchoke	Sanchai Ratiwatana Sonchat Ratiwatana
	Italy	Sanremo Challenger	$ 025,000	Clay	Olivier Patience	Julien Benneteau Nicolas Mahut
29.05.	South Korea	Busan Challenger	$ 050,000	Hard	Lee Hyung-taik	Scott Lipsky Todd Widom
	Germany	Ettlingen Challenger	$ 025,000	Clay	Simon Greul	Vasilis Mazarakis Felipe Parada
	Italy	Turin Challenger	$ 025,000	Clay	Flavio Cipolla	Marcel Granollers Marc López

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
05.06.	Czech Republic	Prostějov Challenger	$ 125,000	Clay	Jan Hájek	František Čermák Jaroslav Levinský
	Germany	Schickedanz Open	$ 050,000	Clay	Florian Mayer	Vasilis Mazarakis Felipe Parada
	Great Britain	Surbiton Challenger	$ 050,000	Grass	Mardy Fish	Jordan Kerr Jim Thomas
	United States	Yuba City Challenger	$ 050,000	Hard	Sam Querrey	Scott Lipsky David Martin
	Italy	Sassuolo Challenger	$ 025,000	Clay	Frederico Gil	Francesco Aldi Tomas Tenconi
12.06.	Switzerland	Lugano Challenger	$ 100,000	Clay	Olivier Patience	Giorgio Galimberti Oliver Marach
	Slovakia	Košice Challenger	$ 025,000	Clay	Nicolas Devilder	Viktor Bruthans Pavel Šnobel
19.06.	Germany	Nord/LB Open	$ 125,000	Clay	Jan Hájek	Tomas Behrend Christopher Kas
	Italy	MILAN Challenger	$ 025,000	Clay	Wayne Odesnik	Giorgio Galimberti Harel Levy
26.06.	Romania	Constanța Challenger	$ 025,000	Clay	Konstantinos Economidis	Konstantinos Economidis Jean-Julien Rojer
	Italy	Reggio Emilia Challenger	$ 025,000	Clay	Olivier Patience	Fabio Colangelo Giancarlo Petrazzuolo

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
03.07.	Spain	Córdoba Challenger	$ 125,000	Hard	Simon Greul	Justin Gimelstob Kevin Kim
	Italy	Biella Challenger	$ 100,000	Clay	Simone Bolelli	Lucas Arnold Ker Agustín Calleri
	Ireland	Dublin Challenger	$ 050,000	Carpet	Mischa Zverev	Jasper Smit Martijn van Haasteren
	United States	Winnetka Challenger	$ 050,000	Hard	Sam Querrey	Cecil Mamiit Eric Taino
	France	Montauban Challenger	$ 025,000	Clay	Lamine Ouahab	Pablo Cuevas Adrián García
10.07.	Poland	Posen Challenger	$ 100,000	Clay	Jan Hájek	Tomasz Bednarek Michał Przysiężny
	Netherlands	Scheveningen Challenger	$ 075,000	Clay	Guillermo García López	Guillermo García López Salvador Navarro
	Ecuador	Cuenca Challenger	$ 025,000	Clay	Carlos Salamanca	Frank Moser Alexander Satschko
	Italy	Mantua Challenger	$ 025,000	Clay	Cristian Villagrán	Pablo Andújar Marcel Granollers
	Germany	Oberstaufen Cup	$ 025,000	Clay	Michal Tabara	Ernests Gulbis Mischa Zverev
17.07.	Colombia	Bogotá Challenger II	$ 125,000	Clay	Santiago Giraldo	Daniel Garza Michael Quintero
	Turkey	Istanbul Challenger	$ 125,000	Hard	Alexander Peya	Alexey Kedryuk Orest Tereshchuk
	United States	Aptos Challenger	$ 075,000	Hard	Alex Kuznetsov	Prakash Amritraj Rohan Bopanna
	Russia	Penza Challenger	$ 050,000	Hard	Farrukh Dustov	Murad Inoyatov Denis Istomin
	Italy	Rimini Challenger	$ 050,000	Clay	Pablo Andújar	Juan Pablo Brzezicki Cristian Villagrán
	Great Britain	Manchester Challenger	$ 025,000	Grass	Harsh Mankad	Josh Goodall Ross Hutchins
24.07.	Brazil	Campos do Jordão Challenger	$ 050,000	Hard	Ricardo Mello	Marcelo Melo André Sá
	Canada	Granby Challenger	$ 050,000	Hard	Frank Dancevic	Alessandro Gravina Gary Lugassy
	United States	Lexington Challenger	$ 050,000	Hard	Lee Hyung-taik	Sanchai Ratiwatana Sonchat Ratiwatana
	Finland	Tampere Challenger	$ 050,000	Clay	Florian Mayer	Thierry Ascione Édouard Roger-Vasselin
	Great Britain	Nottingham Challenger I	$ 025,000	Grass	Antony Dupuis	Martin Lee Jonathan Marray
	Italy	Recanati Challenger	$ 025,000	Hard	Davide Sanguinetti	Simone Bolelli Davide Sanguinetti
	Russia	Togliatti Cup	$ 025,000	Hard	Uros Vico	Alexander Peya Uros Vico
31.07.	Spain	Segovia Challenger	$ 100,000	Hard	Juan Martín del Potro	Paul Baccanello Chris Guccione
	Canada	Vancouver Challenger	$ 100,000	Hard	Rik de Voest	Eric Butorac Travis Parrott
	Italy	Trani Challenger	$ 050,000	Hard	Juan Pablo Guzmán	Leonardo Azzaro Daniele Giorgini
	Brazil	Belo Horizonte Challenger	$ 025,000	Hard	Thiago Alves	Marcelo Melo André Sá
	Russia	Saransk Challenger	$ 025,000	Clay	Igor Sijsling	Alexey Kedryuk Orest Tereshchuk
	Romania	Timișoara Challenger	$ 025,000	Clay	Nicolas Devilder	Victor Crivoi Victor Ioniță

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
07.08.	San Marino	San Marino Challenger	$ 100,000	Clay	Albert Montañés	Máximo González Sergio Roitman
	United States	DBI Tennis Challenger	$ 050,000	Hard	Scott Oudsema	Scott Lipsky David Martin
	Brazil	Joinville Challenger	$ 050,000	Clay	André Ghem	André Ghem Alexandre Simoni
	Spain	Vigo Challenger	$ 037.500	Clay	Pablo Andújar	Pablo Andújar Marcel Granollers
	Russia	St. Petersburg Challenger	$ 025,000	Clay	David Guez	Murad Inoyatov Denis Istomin
14.08.	United States	Bronx Challenger	$ 050,000	Hard	Michael Russell	Martin Lee Harel Levy
	France	Cordenons Challenger	$ 050,000	Clay	Konstantinos Economidis	Francesco Aldi Lovro Zovko
	Austria	Graz Challenger	$ 025,000	Hard	Florian Mayer	Ross Hutchins Jonathan Marray
	Ecuador	Manta Challenger	$ 025,000	Hard	Thiago Alves	Eric Nunez Jean-Julien Rojer
	Uzbekistan	Samarkand Challenger	$ 025,000	Clay	Janko Tipsarević	Satoshi Iwabuchi Gouichi Motomura
21.08.	Italy	Manerbio Challenger	$ 050,000	Clay	Andreas Vinciguerra	Gabriel Moraru Adrian Ungur
	Switzerland	Genf Challenger	$ 037.500	Clay	Jérôme Haehnel	Michal Navrátil Yuri Schukin
	Uzbekistan	Bukhara Challenger	$ 025,000	Hard	Janko Tipsarević	Nicolas Renavand Nicolas Tourte
28.08.	Italy	Como Challenger	$ 025,000	Clay	Simone Bolelli	Jamie Delgado Jamie Murray
	Germany	Black Forest Open	$ 025,000	Clay	Hugo Armando	Tomas Behrend Dominik Meffert
	Slovenia	Kranj Challenger	$ 025,000	Clay	Werner Eschauer	Antonio Baldellou-Esteva Héctor Ruiz-Cadenas

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
04.09.	Romania	Brașov Challenger	$ 025,000	Clay	Marc López	Lazar Magdinčev Predrag Rusevski
	Ukraine	Donetsk Challenger	$ 025,000	Clay	Ilija Bozoljac	Aleksandr Nedovyesov Aleksandr Yarmola
	Germany	Düsseldorf Open Challenger	$ 025,000	Clay	Evgeny Korolev	Hugo Armando Tomas Behrend
	Italy	Genua Challenger	$ 025,000	Clay	Gorka Fraile	Adriano Biasella Marcelo Charpentier
11.09.	France	Orléans Challenger	$ 075,000	Hard (i)	Olivier Rochus	Grégory Carraz Dick Norman
	United States	New Orleans Challenger	$ 050,000	Hard	Cecil Mamiit	Cecil Mamiit Sam Warburg
	Spain	Sevilla Challenger	$ 050,000	Clay	Iván Navarro	Pablo Andújar Marcel Granollers
	Brazil	Belém Challenger	$ 025,000	Clay	Guillermo Cañas	Brian Dabul Cristian Villagrán
18.09.	Poland	Szczecin Challenger	$ 125,000	Clay	Nicolás Lapentti	Tomas Behrend Christopher Kas
	United States	Lubbock Challenger	$ 050,000	Hard	Sam Querrey	Chris Drake Scott Lipsky
	Spain	Tarragona Challenger	$ 050,000	Clay	Paolo Lorenzi	Hugo Armando Gabriel Trujillo Soler
	Bosnia and Herzegovina	Banja Luka Challenger	$ 025,000	Clay	Marco Mirnegg	Joseph Sirianni Stefan Wauters
25.09.	France	Grenoble Challenger	$ 050,000	Hard (i)	Michaël Llodra	Teymuraz Gabashvili Evgeny Korolev
	United States	Tulsa Challenger	$ 050,000	Hard	Bobby Reynolds	Bobby Reynolds Rajeev Ram
	Slovakia	Bratislava Challenger	$ 025,000	Clay	Michal Mertiňák	Eric Butorac Travis Parrott
	Brazil	Gramado Challenger	$ 025,000	Hard	Franco Ferreiro	Franco Ferreiro Martín Vilarrubí

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
02.10.	Belgium	Mons Challenger	$ 125,000	Hard (i)	Janko Tipsarević	Jean-Claude Scherrer Lovro Zovko
	Ecuador	Quito Challenger	$ 025,000	Clay	Chris Guccione	Rogério Dutra Silva Marcelo Melo
09.10.	United States	Sacramento Challenger	$ 075,000	Hard	Paul Goldstein	Paul Goldstein Jeff Morrison
	France	Rennes Challenger	$ 050,000	Hard (i)	Jo-Wilfried Tsonga	Grégory Carraz Mathieu Montcourt
	Spain	Barcelona Challenger	$ 025,000	Clay	Marcel Granollers	Tomas Behrend Flavio Cipolla
	Colombia	Medellín Challenger	$ 025,000	Clay	Chris Guccione	André Ghem Marcelo Melo
16.10.	Colombia	Bogotá Challenger III	$ 075,000	Clay	Diego Hartfield	Marcelo Melo André Sá
	United States	Calabasas Challenger	$ 050,000	Hard	Mark Philippoussis	Robert Kendrick Cecil Mamiit
	Denmark	Kolding Challenger	$ 050,000	Hard (i)	Michaël Llodra	Jeff Coetzee Rogier Wassen
23.10.	Uruguay	Montevideo Challenger	$ 075,000	Clay	Guillermo Cañas	Máximo González Sergio Roitman
	Great Britain	Nottingham Challenger II	$ 025,000	Hard (i)	Alexander Waske	Filip Prpic Nicolas Tourte
30.10.	South Korea	Seoul Challenger	$ 100,000	Hard	Lee Hyung-taik	Alexander Peya Björn Phau
	Brazil	Aracaju Challenger	$ 075,000	Clay	Sergio Roitman	Máximo González Sergio Roitman
	Germany	Lambertz Open by STAWAG	$ 050,000	Carpet (i)	Rainer Schüttler	Mischa Zverev Ernests Gulbis
	United States	Louisville Challenger	$ 050,000	Hard (i)	Amer Delić	Robin Haase Igor Sijsling
	Canada	Rimouski Challenger	$ 025,000	Hard (i)	Kristian Pless	Frederik Nielsen Kristian Pless

Date	Country	Tournament	Prizemoney	Surface	Singles champion	Doubles champions
06.11.	Slovakia	Bratislava Challenger	$ 100,000	Hard (i)	Michal Mertiňák	Eric Butorac Travis Parrott
	Argentina	Buenos Aires Challenger	$ 075,000	Clay	Guillermo Cañas	André Ghem Flávio Saretta
	South Korea	Busan Challenger	$ 075,000	Hard	Lee Hyung-taik	Scott Lipsky Todd Widom
	United States	Nashville Challenger	$ 075,000	Hard (i)	Robin Haase	Scott Lipsky David Martin
	Germany	Bauer Watertechnology Cup	$ 025,000	Carpet (i)	Ernests Gulbis	Josh Goodall Ross Hutchins
13.11.	Ukraine	Dnipropetrovs'k Challenger	$ 125,000	Hard (i)	Dmitry Tursunov	Sergiy Stakhovsky Orest Tereshchuk
	Paraguay	Asunción Challenger	$ 075,000	Clay	Guillermo Cañas	Tomas Behrend André Ghem
	France	Champaign Challenger	$ 050,000	Hard (i)	Amer Delić	Rajeev Ram Rik de Voest
	Ecuador	Guayaquil Challenger	$ 050,000	Clay	Sergio Roitman	Juan Pablo Brzezicki Leonardo Mayer
	Finland	Helsinki Challenger	$ 050,000	Hard (i)	Michael Berrer	Jasper Smit Martijn van Haasteren
	Australia	Caloundra Challenger	$ 025,000	Hard	Lu Yen-hsun	Nathan Healey Robert Smeets
20.11.	Italy	Naples Challenger	$ 050,000	Clay	Potito Starace	Tomáš Cibulec Łukasz Kubot
	Australia	Kawana Challenger	$ 025,000	Hard (i)	Julien Jeanpierre	Nathan Healey Robert Smeets
	Mexico	Puebla Challenger	$ 025,000	Hard	Robert Kendrick	Daniel Garza Jean-Julien Rojer
	Great Britain	LTA Shrewsbury Challenger	$ 025,000	Hard (i)	Alex Bogdanovic	Philipp Marx Frederik Nielsen
27.11.	United States	Maui Challenger	$ 050,000	Hard	Michael Russell	Rajeev Ram Brian Wilsson