The ATP Challenger Series is the second-tier tour for professional tennis organised by the Association of Tennis Professionals (ATP). The 1982 ATP Challenger Series calendar comprises 41 tournaments, with prize money ranging from $25,000 up to $50,000.^[1]

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
January 4	No tournaments scheduled.
January 11	Perth Challenger Perth, Australia Grass – $25,000 – 64S/32D Singles draw – Doubles draw	Eddie Edwards 6–3, 6–2	Craig A. Miller	Brad Guan Dale Collings	Wayne Hampson Brad Drewett Syd Ball Andy Andrews
		Syd Ball John Fitzgerald 6–3, 6–3	Brett Edwards Cliff Letcher
January 18	No tournaments scheduled.
January 25	No tournaments scheduled.

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
February 1	No tournaments scheduled.
February 8	Nairobi Challenger Nairobi, Kenya Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Haroon Ismail 1–6, 6–1, 6–3	Egan Adams	Peter Spang Harald Theissen	Drew Gitlin Bernhard Pils Ed Nagel Georges Goven
		Drew Gitlin Jan Kodeš 6–4, 3–6, 6–3	Bernhard Pils Helmar Stiegler
February 15	Buchholz Challenger Buchholz, West Germany $25,000 – hard (I) – 64S/32D Singles draw – Doubles draw	Mats Wilander 6–3, 6–3	Sean Sorensen	Jaroslav Navrátil Jan Gunnarsson	Jakob Hlasek Rocky Royer Michael Westphal Mike Gandolfo
		Mike Gandolfo Derek Tarr 6–4, 6–4	Jiří Průcha Tenny Svensson
	Tunis Challenger Tunis, Tunisia Clay – $50,000 – 32S/16D Singles draw – Doubles draw	Juan Avendaño 6–4, 6–4, 6–4	José García Requena	Craig Wittus Damir Keretić	Thomas Högstedt Ismail El Shafei Thierry Stevaux Egan Adams
		Steve Meister Craig Wittus 6–4, 1–6, 6–1	Ismail El Shafei Jan Kodeš
February 22	No tournaments scheduled.

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
March 1	São Paulo-1 Challenger São Paulo, Brazil $25,000 – hard (I) – 32S/16D Singles draw – Doubles draw	Thomaz Koch 7–6, 7–6	Cássio Motta	Renato Joaquim Givaldo Barbosa	Fernando Roese Roger Guedes Andres Molina Júlio Góes
		Givaldo Barbosa Júlio Góes 6–4, 6–1	Thomaz Koch Cássio Motta
March 8	No tournaments scheduled.
March 15	No tournaments scheduled.
March 22	No tournaments scheduled.
March 29	No tournaments scheduled.

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
April 5	Curitiba Challenger Curitiba, Brazil Clay – $50,000 – 32S/16D Singles draw – Doubles draw	Carlos Kirmayr 6–2, 6–4	João Soares	Alejandro Gattiker Cássio Motta	Givaldo Barbosa Marcos Hocevar Júlio Góes Alejandro Ganzábal
		Givaldo Barbosa João Soares 7–6, 6–1	Carlos Kirmayr Cássio Motta
	Johannesburg Challenger Johannesburg, South Africa Hard – $25,000 – 48S/24D Singles draw – Doubles draw	Danie Visser 6–4, 6–3	Van Winitsky	Rory Chappell Francisco González	Hank Pfister Barry Moir Tim Wilkison Terry Moor
		Freddie Sauer Schalk van der Merwe 6–2, 6–1	Danie Visser Tian Viljoen
	Tokyo Challenger Tokyo, Japan Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Nduka Odizor 6–4, 3–6, 6–1	Jim Gurfein	David Dowlen Pat Cash	David Mustard Peter Feigl Craig A. Miller Henrik Sundström
		Pat Cash Craig A. Miller 6–2, 6–2	Bruce Derlin David Mustard
April 12	Barcelona Challenger Barcelona, Spain Clay – $25,000 – 32S/32D Singles draw – Doubles draw	Diego Pérez 6–3, 6–0	Alberto Tous	Fernando Luna Roberto Vizcaíno	Jean-Louis Haillet Steve Krulevitz Broderick Dyke Sergio Casal
		Sergio Casal Christoph Zipf 5–7, 6–1, 6–2	Broderick Dyke Hans-Peter Kandler
	Hypo Group Tennis International Bari, Italy Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Paul McNamee 6–2, 6–2	Balázs Taróczy	Marko Ostoja Tomáš Šmíd	Famiano Meneschincheri Željko Franulović Corrado Barazzutti Jan Gunnarsson
		Alejandro Ganzábal Gustavo Guerrero 6–3, 6–2	Luca Bottazzi Ivan Dupasquier
	Chigasaki Challenger Chigasaki, Japan Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Tom Cain 6–4, 6–3	Henrik Sundström	Peter Feigl James Delaney	Craig A. Miller Peter Johnston Wally Masur Sashi Menon
		Charles Strode Morris Strode 6–3, 6–4	Sashi Menon Walter Redondo
April 19	Parioli Challenger Parioli, Italy Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Corrado Barazzutti 6–3, 2–6, 6–1	Alejandro Ganzábal	Florin Segărceanu Gabriel Urpí	Željko Franulović Cássio Motta Karl Meiler Brad Guan
		Iván Camus Gabriel Urpí 3–6, 6–4, 6–3	Guillermo Aubone Fernando Maynetto
	Nagareyama Challenger Nagareyama, Japan Hard – $25,000 – 32S/16D Singles draw – Doubles draw	Russell Simpson 6–3, 6–7, 7–5	Charles Strode	Nduka Odizor Jim Gurfein	Dave Siegler Peter Johnston James Delaney Bruce Kleege
		Charles Strode Morris Strode 4–6, 6–1, 6–4	Sashi Menon Walter Redondo
April 26	Toyota City Challenger Toyota City, Japan Hard – $30,000 – 32S/16D Singles draw – Doubles draw	Wally Masur NA	Joel Bailey	Charles Strode Pat Cash	Morris Strode Warren Maher John McCurdy Ian Harris

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
May 3	Berkeley Challenger Berkeley, USA Hard – $25,000 – 64S/32D Singles draw – Doubles draw	Scott McCain 6–3, 7–5	David Pate	Trey Waltke Martin Davis	Larry Stefanki Andy Kohlberg Michael Wayman Lloyd Bourne
		Lloyd Bourne Matt Mitchell 6–4, 6–4	Billy Martin Bruce Nichols
	Galatina Challenger Galatina, Italy Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Dominique Bedel 7–6, 1–6, 7–5	Pender Murphy	Thomas Stålhandske Sergio Casal	Ney Keller Gerald Mild Carlos Castellan Gabriel Urpí
		Sergio Casal Alejandro Pierola 6–4, 6–4	Gianni Marchetti Vincenzo Naso
	Solihull Challenger Solihull, Great Britain Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Andrew Jarrett 6–3, 6–1	Jonathan Smith	Schalk van der Merwe Christophe Freyss	David Mustard Jeremy Bates Louk Sanders Greg Whitecross
		Anand Amritraj Brad Guan 6–4, 3–6, 6–3	Andrew Jarrett Jonathan Smith
May 10	Lee-on-Solent Challenger Lee-on-Solent, Great Britain Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Brent Pirow 6–7, 6–4, 6–1	Derek Tarr	Craig A. Miller Charlie Fancutt	Raymond Moore Greg Whitecross Warren Maher Anand Amritraj
		Danie Visser Tian Viljoen 6–1, 1–6, 6–3	Derek Tarr Schalk van der Merwe
May 17	No tournaments scheduled.
May 24	No tournaments scheduled.
May 31	Brescia Challenger Brescia, Italy Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Florin Segărceanu 2–6, 6–0, 6–4	Dominique Bedel	Simone Colombo Carlos Castellan	Jimmy Brown Alejandro Pierola Marko Ostoja Gianni Marchetti
		Carlos Kirmayr Florin Segărceanu 7–6, 6–2	Patrizio Parrini Federico Rinaldi
	Tampere Open Tampere, Finland Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Peter Bastiansen 3–6, 7–5, 6–2	Steve Krulevitz	Stanislav Birner Kimmo Alkio	Hans-Dieter Beutel Christoph Zipf Michael Mortensen Rocky Royer
		Magnus Tideman Jörgen Windahl 6–4, 7–6	Stanislav Birner Francisco González

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
June 7	No tournaments scheduled.
June 14	No tournaments scheduled.
June 21	No tournaments scheduled.
June 28	Travemünde Challenger Travemünde, West Germany Clay – $25,000 – 64S/32D Singles draw – Doubles draw	Dominique Bedel 6–4, 6–4	Wolfgang Popp	Christophe Freyss Gianluca Rinaldini	Slobodan Živojinović Andy Kohlberg Per Hjertquist Rocky Royer
		Wolfgang Popp Roland Stadler 6–4, 6–2	Brad Guan Warren Maher

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
July 5	Cologne Challenger Cologne, West Germany Clay – $25,000 – 64S/32D Singles draw – Doubles draw	Dominique Bedel 2–6, 6–3, 6–4	Andreas Maurer	Scott Lipton Per Hjertquist	Eddie Edwards Florin Segărceanu Damir Keretić Jan Gunnarsson
		Brad Guan Warren Maher 6–2, 6–4	Chris Johnstone Cliff Letcher
July 12	Lisbon Challenger Lisbon, Portugal Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Rocky Royer 6–3, 1–6, 6–3	Robbie Venter	Francisco Ferrer Andrew Jarrett	Peter Johnston Michiel Schapers Patrice Kuchna Deon Joubert
		John Feaver Andrew Jarrett 7–5, 6–3	Richard Akel Eduardo Oncins
July 19	Campos Challenger Campos, Brazil Clay – $50,000 – 32S/16D Singles draw – Doubles draw	Mark Dickson 6–3, 6–4	Egan Adams	Ricardo Cano Mike Brunnberg	Bruce Kleege Júlio Góes Cássio Motta Thomaz Koch
		Thomaz Koch José Schmidt 6–2, 6–7, 7–6	Givaldo Barbosa João Soares
July 26	Neu-Ulm Challenger Neu-Ulm, West Germany Clay – $25,000 – 64S/32D Singles draw – Doubles draw	Karl Meiler 2–6, 7–6, 6–1	Scott Lipton	Alberto Tous Andrew Jarrett	Andreas Maurer Eric Jelen Damir Keretić Hans Kary
		Karl Meiler Jaroslav Navrátil 6–3, 6–3	Dusan Kulhaj John Van Nostrand
	Rio de Janeiro Open Rio de Janeiro, Brazil Clay – $50,000 – 64S/32D Singles draw – Doubles draw	João Soares 6–1, 0–6, 6–1	Mark Dickson	Dominique Bedel Gianluca Rinaldini	Alejandro Pierola Givaldo Barbosa Magnus Tideman Cássio Motta
		Dominique Bedel Belus Prajoux 6–2, 6–7, 6–2	Mark Dickson Joel Hoffman
	San Benedetto Challenger San Benedetto, Italy Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Željko Franulović 6–4, 6–1	Ilie Năstase	Luca Bottazzi Tony Giammalva	Massimo Zampieri Florin Segărceanu Paolo Bertolucci Pavel Huťka
		Ilie Năstase Florin Segărceanu 5–7, 7–6, 7–6	Gianni Marchetti Enzo Vattuone

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
August 2	Knokke Challenger Knokke, Belgium Clay – $50,000 – 32S/16D Singles draw – Doubles draw	Tomáš Šmíd 6–2, 6–2, 6–0	Željko Franulović	Per Hjertquist Bruce Derlin	Bernard Boileau Haroon Ismail Gianni Ocleppo Wayne Hampson
		Zoltán Kuhárszky Hans Kary 5–7, 6–2, 6–4	Jan Gunnarsson Jeff Simpson
	Porto Alegre Challenger Porto Alegre, Brazil Clay – $50,000 – 64S/32D Singles draw – Doubles draw	Dominique Bedel 6–2, 3–6, 7–6	Cássio Motta	Mark Dickson Ricardo Rivera	Belus Prajoux Egan Adams Juan Carlos Andrade Ney Keller
		Givaldo Barbosa Ricardo Ycaza 6–3, 6–4	Rocky Royer Magnus Tideman
August 9	Ostend Challenger Ostend, Belgium Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Libor Pimek 6–2, 7–5	Haroon Ismail	Jaroslav Navrátil Derek Tarr	Andrew Jarrett Miguel Mir Stefan Svensson Jan Gunnarsson
		John Feaver Andrew Jarrett 6–2, 6–3	Joel Bailey Haroon Ismail
	Brasília Challenger Brasília, Brazil Clay – $50,000 – 64S/32D Singles draw – Doubles draw	Mark Dickson 3–6, 6–3, 6–4	Givaldo Barbosa	Cássio Motta Belus Prajoux	Ivan Kley Júlio Góes Eduardo Bengoechea Bruce Kleege
		Givaldo Barbosa João Soares 6–4, 3–6, 7–6	José Luis Damiani Ricardo Ycaza
August 16	Le Touquet Challenger Le Touquet, France Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Jeff Simpson 6–7, 6–2, 6–1	Roland Stadler	Thomas Stålhandske Dan Cassidy	Jacques Grandjean Peter Johnston Jan Gunnarsson Russell Barlow
		John Feaver Jan Gunnarsson 6–2, 5–7, 6–1	David Graham Laurie Warder
	Tarragona Challenger Tarragona, Spain Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Sergio Casal 5–7, 6–2, 6–4	Jairo Velasco Sr.	Francesco Cancellotti Diego Pérez	Roberto Vizcaíno Eduardo Osta Martín Jaite Alberto Tous
		Sean Brawley Christo Steyn 6–3, 6–0	Francisco Ferrer Martín Jaite
	São Paulo-2 Challenger São Paulo, Brazil Clay – $50,000 – 32S/16D Singles draw – Doubles draw	Víctor Pecci 6–3, 4–6, 6–3	José Higueras	Magnus Tideman Ricardo Ycaza	Dominique Bedel Mark Dickson Cássio Motta Pablo Arraya
		Charles Strode Morris Strode 6–1, 6–4	Pablo Arraya Víctor Pecci
August 23	Brussels Challenger Brussels, Belgium Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Jan Gunnarsson 6–4, 6–4	Alberto Tous	Jörgen Windahl Sergio Casal	Jean-Marc Piacentile Fernando Maynetto Stefan Svensson Thierry Stevaux
		Alberto Tous Raúl Viver 3–6, 6–3, 7–5	David Graham Laurie Warder
	São Paulo-3 Challenger São Paulo, Brazil $25,000 – carpet (I) – 32S/16D Singles draw – Doubles draw	Júlio Góes 7–5, 6–1	Ney Keller	Marcos Hocevar Nelson Aerts	Edvaldo Oliveira Fernando Roese Givaldo Barbosa Carlos Kirmayr
		Thomaz Koch José Schmidt 6–4, 7–6	Júlio Góes Ney Keller
August 30	No tournaments scheduled.

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
September 6	International Tournament of Messina Messina, Italy Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Pablo Arraya 7–5, 6–4	Mario Martinez	Antonio Zugarelli Eduardo Osta	Patrice Kuchna Miguel Mir David de Miguel Sergio Casal
		Gianni Marchetti Enzo Vattuone 6–0, 4–6, 6–2	Eduardo Osta Roberto Vizcaíno
September 13	No tournaments scheduled.
September 20	Thessaloniki Challenger Thessaloniki, Greece Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Nduka Odizor 6–3, 7–6	Gianni Ocleppo	Bruce Foxworth David Schneider	Guillermo Aubone Gordon Simmonds Rodney Crowley Peter Bastiansen
		John Feaver Nduka Odizor 7–6, 7–6	Peter Bastiansen Michael Mortensen
September 27	No tournaments scheduled.

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
October 4	No tournaments scheduled.
October 11	No tournaments scheduled.
October 18	Porto Challenger Porto, Portugal Clay – $25,000 – 32S/16D Singles draw – Doubles draw	Jairo Velasco Sr. 6–7, 6–3, 6–3	Juan Avendaño	José García Requena Christophe Bernelle	Jean-Marc Piacentile Miloslav Mečíř Andres Molina Ricardo Sánchez
		Libor Pimek Thierry Stevaux 4–6, 7–6, 7–5	Andy Kohlberg Robbie Venter
October 25	Sydney Challenger Sydney, Australia Hard – $25,000 – 64S/32D Singles draw – Doubles draw	Pat Cash 7–5, 6–7, 6–2	Craig A. Miller	Wally Masur Chris Johnstone	John Benson Broderick Dyke Cliff Letcher Rand Evett
		Peter Johnston John McCurdy 6–7, 7–6, 7–6	John Benson Chris Johnstone

Week of	Tournament	Champions	Runners-up	Semifinalists	Quarterfinalists
November 1	No tournaments scheduled.
November 8	No tournaments scheduled.
November 15	No tournaments scheduled.
November 22	Benin City Challenger Benin City, Nigeria Hard – $50,000 – 32S/16D Singles draw – Doubles draw	Gianni Ocleppo 6–3, 6–3	Nduka Odizor	Robert Reininger Haroon Ismail	Jakob Hlasek David Imonitie Martin Guntrip Colin Dowdeswell
		Hans Kary Gianni Ocleppo Defaulted	Colin Dowdeswell Haroon Ismail

These tables present the number of singles (S) and doubles (D) titles won by each player and each nation during the season, within all the tournament categories of the 1982 ATP Challenger Series. The players/nations are sorted by: 1) total number of titles (a doubles title won by two players representing the same nation counts as only one win for the nation); 2) a singles > doubles hierarchy; 3) alphabetical order (by family names for players).

Total	Player	S	D
5	Dominique Bedel (FRA)	4	1
4	Givaldo Barbosa (BRA)	0	4
4	John Feaver (GBR)	0	4
3	Nduka Odizor (NGR)	2	1
3	Sergio Casal (ESP)	1	2
3	Andrew Jarrett (GBR)	1	2
3	Thomaz Koch (BRA)	1	2
3	Florin Segărceanu (ROU)	1	2
3	João Soares (BRA)	1	2
3	Charles Strode (USA)	0	3
3	Morris Strode (USA)	0	3
2	Mark Dickson (USA)	2	0
2	Pat Cash (AUS)	1	1
2	Júlio Góes (BRA)	1	1
2	Jan Gunnarsson (SWE)	1	1
2	Carlos Kirmayr (BRA)	1	1
2	Karl Meiler (FRG)	1	1
2	Gianni Ocleppo (ITA)	1	1
2	Libor Pimek (TCH)	1	1
2	Danie Visser (RSA)	1	1
2	Brad Guan (AUS)	0	2
2	Hans Kary (AUT)	0	2
2	José Schmidt (BRA)	0	2
1	Pablo Arraya (PER)	1	0
1	Juan Avendaño (ESP)	1	0
1	Corrado Barazzutti (ITA)	1	0
1	Peter Bastiansen (DEN)	1	0
1	Tom Cain (USA)	1	0
1	Eddie Edwards (RSA)	1	0
1	Željko Franulović (YUG)	1	0
1	Haroon Ismail (ZIM)	1	0
1	Wally Masur (AUS)	1	0
1	Scott McCain (USA)	1	0
1	Paul McNamee (AUS)	1	0
1	Víctor Pecci (PAR)	1	0
1	Diego Pérez (URU)	1	0
1	Brent Pirow (RSA)	1	0
1	Rocky Royer (USA)	1	0
1	Jeff Simpson (NZL)	1	0
1	Russell Simpson (NZL)	1	0
1	Tomáš Šmíd (TCH)	1	0
1	Jairo Velasco Sr. (COL)	1	0
1	Mats Wilander (SWE)	1	0
1	Anand Amritraj (IND)	0	1
1	Syd Ball (AUS)	0	1
1	Lloyd Bourne (USA)	0	1
1	Sean Brawley (USA)	0	1
1	Iván Camus (CHI)	0	1
1	John Fitzgerald (AUS)	0	1
1	Mike Gandolfo (USA)	0	1
1	Alejandro Ganzábal (ARG)	0	1
1	Drew Gitlin (USA)	0	1
1	Gustavo Guerrero (ARG)	0	1
1	Peter Johnston (AUS)	0	1
1	Jan Kodeš (TCH)	0	1
1	Zoltan Kuharszky (HUN)	0	1
1	Warren Maher (AUS)	0	1
1	Gianni Marchetti (ITA)	0	1
1	John McCurdy (AUS)	0	1
1	Steve Meister (USA)	0	1
1	Craig A. Miller (AUS)	0	1
1	Matt Mitchell (USA)	0	1
1	Ilie Năstase (ROU)	0	1
1	Jaroslav Navrátil (TCH)	0	1
1	Alejandro Pierola (CHI)	0	1
1	Wolfgang Popp (FRG)	0	1
1	Belus Prajoux (CHI)	0	1
1	Freddie Sauer (RSA)	0	1
1	Roland Stadler (SUI)	0	1
1	Thierry Stevaux (BEL)	0	1
1	Christo Steyn (RSA)	0	1
1	Derek Tarr (RSA)	0	1
1	Magnus Tideman (SWE)	0	1
1	Alberto Tous (ESP)	0	1
1	Gabriel Urpi (ESP)	0	1
1	Schalk van der Merwe (RSA)	0	1
1	Enzo Vattuone (ITA)	0	1
1	Tian Viljoen (RSA)	0	1
1	Raul Viver (ECU)	0	1
1	Jörgen Windahl (SWE)	0	1
1	Craig Wittus (USA)	0	1
1	Ricardo Ycaza (ECU)	0	1
1	Christoph Zipf (FRG)	0	1

Total	Nation	S	D
13	United States (USA)	5	8
11	Brazil (BRA)	4	7
8	Australia (AUS)	3	5
7	South Africa (RSA)	3	4
6	Spain (ESP)	2	4
5	France (FRA)	4	1
5	Czechoslovakia (TCH)	2	3
5	Great Britain (GBR)	1	4
4	Italy (ITA)	2	2
4	Sweden (SWE)	2	2
4	West Germany (FRG)	1	3
3	Nigeria (NGR)	2	1
3	Romania (ROU)	1	2
3	Chile (CHI)	0	3
2	New Zealand (NZL)	2	0
2	Austria (AUT)	0	2
2	Ecuador (ECU)	0	2
1	Colombia (COL)	1	0
1	Denmark (DEN)	1	0
1	Paraguay (PAR)	1	0
1	Peru (PER)	1	0
1	Uruguay (URU)	1	0
1	Yugoslavia (YUG)	1	0
1	Zimbabwe (ZIM)	1	0
1	Argentina (ARG)	0	1
1	Belgium (BEL)	0	1
1	Hungary (HUN)	0	1
1	India (IND)	0	1
1	Switzerland (SUI)	0	1

• 1982 Grand Prix
• Association of Tennis Professionals
• International Tennis Federation

• Official ATP World Tour Website: Results Archive
• ITF Tennis: Tournament Search Archived 2010-02-12 at the Wayback Machine