L'ATP Challenger Tour 2018 è stata una serie di tornei internazionali maschili studiati per consentire a giocatori di seconda fascia di acquisire un ranking sufficiente per accedere ai tornei del circuito maggiore. Si sono tenuti 159 tornei con montepremi da 50.000 $ fino a 150.000 $. È stata la 41ª edizione del circuito Challenger, la 10ª sotto questo nome.

Calendario Gennaio SettimanaTorneoCampioneFinalistaSemifinalistiEliminati ai quarti1 gennaio Bangkok Challenger IBangkok, Thailandia Challenger 80 – 50.000$+HCemento – 48S/4Q/16D Marcel Granollers4–6, 6–3, 7–5 Mats Moraing Blaž Rola Oleksandr Nedovjesov Lee Duck-hee Evgenij Karlovskij Zdeněk Kolář Zhang Ze Gerard Granollers Marcel Granollers6–3, 7–6(6) Zdeněk Kolář Gonçalo Oliveira Internationaux de Nouvelle-CalédonieNumea, Nuova Caledonia Challenger 90 –75.000$+H Cemento – 48S/4Q/16D Noah Rubin 7–5, 6–4 Taylor Fritz Gleb Sakharov Kenny de Schepper Corentin Moutet Casper Ruud Cameron Norrie Tim Pütz Hugo Nys Tim Pütz6–2, 6–2 Alejandro González Jaume Munar City of Playford Tennis InternationalPlayford, Australia Challenger 80 – 75.000$Cemento – 48S/4Q/16D Jason Kubler6–4, 6–2 Brayden Schnur Evan King Reilly Opelka Marinko Matosevic Norbert Gombos Omar Jasika Alex Bolt Mackenzie McDonald Tommy Paul7–6(4), 6–4 Maverick Banes Jason Kubler8 gennaio Bangkok Challenger IIBangkok, Thailandia Challenger 80 – 50.000$+HCemento – 48S/4Q/16D Marcel Granollers4–6, 6–2, 6–0 Enrique López Pérez Bernabé Zapata Miralles Mats Moraing Yusuke Takahashi Evgenij Karlovskij Pedro Martínez Matteo Viola James Cerretani Joe Salisbury6(5)–7, 6–3, [10–8] Enrique López Pérez Pedro Martínez Canberra ChallengerCanberra, Australia Challenger 80 – 75.000$Cemento – 48S/4Q/16D Andreas Seppi5–7, 6–4, 6–3 Márton Fucsovics Maxime Janvier Víctor Estrella Burgos Hugo Grenier Elliot Benchetrit Guillermo García López Florian Mayer Jonathan Erlich Divij Sharan7–6(1), 6–2 Hans Podlipnik Castillo Andrėj Vasileŭski15 gennaio Koblenz OpenCoblenza, Germania Challenger 80 – €43.000+HCemento indoor – 48S/4Q/16D Mats Moraing6–2, 6–1 Kenny de Schepper Il'ja Ivaška Serhij Stachovs'kyj Yannick Maden Aleksej Vatutin Mohamed Safwat Yasutaka Uchiyama Romain Arneodo Tristan-Samuel Weissborn6(4)–7, 7–5, [10–6] Sander Arends Antonio Šančić22 gennaio Challenger Series – Newport BeachNewport Beach, Stati Uniti Challenger 125 – 150.000$+HCemento – 48S/4Q/16D Taylor Fritz3–6, 7–5, 6–0 Bradley Klahn Reilly Opelka Cristian Garín Matthias Bachinger Noah Rubin Darian King Miomir Kecmanović James Cerretani Leander Paes6–4, 7–5 Treat Huey Denis Kudla Open de RennesRennes, Francia Challenger 90 – €64.000+HCemento indoor – 48S/4Q/16D Vasek Pospisil6–1, 6–2 Ričardas Berankis Liam Broady Antoine Hoang Gleb Sakharov Manuel Guinard Yannick Maden Quentin Halys Sander Gillé Joran Vliegen6–3, 6(1)–7, [10–7] Sander Arends Antonio Šančić29 gennaio Challenger of DallasDallas, Stati Uniti Challenger 100 – 125.000$Cemento indoor – 48S/4Q/16D Kei Nishikori6–1, 6–4 Mackenzie McDonald Jason Jung Denis Kudla Dominik Koepfer Miomir Kecmanović Taylor Fritz Tim Smyczek Jeevan Nedunchezhiyan Christopher Rungkat6–4, 3–6, [10–7] Leander Paes Joe Salisbury Burnie InternationalBurnie, Australia Challenger 80 – 75.000$Cemento – 48S/4Q/16D Stéphane Robert6–1, 6–2 Daniel Altmaier Jason Kubler Yoshihito Nishioka Marcel Granollers Yusuke Takahashi Evan King Andrew Whittington Gerard Granollers Marcel Granollers7–6(8), 6–2 Evan King Max Schnur Open Quimper Bretagne OccidentaleQuimper, Francia Challenger 80 – €43.000Cemento indoor – 48S/4Q/16D Quentin Halys6–3, 7–6(1) Aleksej Vatutin Stefanos Tsitsipas Calvin Hemery Stefano Napolitano Maxime Janvier Tristan Lamasine Jaume Munar Ken Skupski Neal Skupski6–3, 3–6, [10–7] Sander Gillé Joran Vliegen

Febbraio SettimanaTorneoCampioniFinalistiSemifinalistiEliminati ai quarti5 febbraio Kunal Patel San Francisco OpenSan Francisco, Stati UnitiChallenger 90 – $100.000Cemento indoor  – 32S/27Q/16D Jason Jung6–4, 2–6, 7–6(5) Dominik Koepfer Dennis Novikov Miomir Kecmanović Filip Peliwo Bradley Klahn Michael Mmoh Noah Rubin Marcelo Arévalo Roberto Maytín6–3, 6(5)–7, [10–7] Luke Bambridge Joe Salisbury Launceston Tennis InternationalLaunceston, Australia Challenger 80 – $75.000Cemento – 48S/4Q/16D Marc Polmans6–2, 6–2 Bradley Mousley Marcel Granollers Andrew Harris Alexander Sarkissian Kevin King Jason Kubler Dayne Kelly Alex Bolt Bradley Mousley7–6(6), 6–0 Sekou Bangoura Nathan Pasha Hungarian Challenger OpenBudapest, Ungheria Challenger 80 – €64.000Cemento indoor – 48S/4Q/16D Vasek Pospisil7–6(3), 3–6, 6–3 Nicola Kuhn Márton Fucsovics Nikola Milojević Kevin Krawietz Jürgen Zopp Elias Ymer Constant Lestienne Félix Auger-Aliassime Nicola Kuhn2–6, 6–2, [11–9] Marin Draganja Tomislav Draganja12 febbraio Challenger La MancheCherbourg, Francia Challenger 80 – €43.000+HCemento indoor – 48S/4Q/16D Maximilian Marterer6–4, 7–5 Constant Lestienne Mats Moraing Matteo Berrettini Mikael Ymer Tobias Kamke Kenny de Schepper Alexei Popyrin Romain Arneodo Tristan-Samuel Weissborn6–3, 1–6, [10–4] Antonio Šančić Ken Skupski Chennai Open ChallengerChennai, India Challenger 80 – $50.000+HCemento – 48S/4Q/16D Jordan Thompson7–5, 3–6, 7–5 Yuki Bhambri Pedro Martínez Lee Duck-hee Danilo Petrović Mohamed Safwat Antoine Escoffier Yasutaka Uchiyama Sriram Balaji Vishnu Vardhan7–6(5), 5–7, [10–5] Cem İlkel Danilo Petrović19 febbraio Internazionali di Tennis di BergamoBergamo, Italia Challenger 90 – €64.000+HCemento indoor – 48S/4Q/16D Matteo Berrettini6–2, 3–6, 6–2 Stefano Napolitano Jürgen Zopp Lorenzo Sonego Salvatore Caruso Adam Pavlásek Mohamed Safwat Andrea Arnaboldi Scott Clayton Jonny O'Mara5–7, 6–3, [15–13] Laurynas Grigelis Alessandro Motti All Japan Indoor Tennis ChampionshipsKyoto, GiapponeChallenger 80 – $50.000+HSintetico indoor – 32S/22Q/16D John Millman7–5, 6–1 Jordan Thompson Blake Ellis Tim Pütz Hubert Hurkacz Gō Soeda Tobias Kamke Kaichi Uchida Luke Saville Jordan Thompson6–3, 5–7, [10–6] Gō Soeda Yasutaka Uchiyama Morelos OpenCuernavaca, Messico Challenger 80 – $50.000+HCemento – 48S/4Q/16D Dennis Novikov6–4, 6–3 Cristian Garín Thanasi Kokkinakis Peđa Krstin Andrej Martin Dmitrij Popko Alexander Sarkissian Kevin King Roberto Maytín Fernando Romboli7–5, 6–3 Evan King Nathan Pasha26 febbraio Challenger Series - Indian WellsIndian Wells, Stati Uniti Challenger 125 – $150.000+HCemento – 48S/4Q/16D Martin Kližan6–3, 6–3 Darian King Taylor Fritz Vasek Pospisil Marius Copil Dudi Sela Christian Harrison Peter Polansky Austin Krajicek Jackson Withrow6(3)–7, 6–1, [11–9] Evan King Nathan Pasha Keio Challenger International Tennis TournamentYokohama, Giappone Challenger 80 – $75.000Cemento – 48S/4Q/16D Yasutaka Uchiyama2–6, 6–3, 6–4 Tatsuma Itō Jordan Thompson Cem İlkel Stéphane Robert Gō Soeda Tobias Kamke Hiroki Moriya Tobias Kamke Tim Pütz3–6, 7–5, [12–10] Sanchai Ratiwatana Sonchat Ratiwatana Punta OpenPunta del Este, Uruguay Challenger 80 – $50.000+HTerra rossa – 48S/4Q/16D Guido Andreozzi3–6, 6–4, 6–3 Simone Bolelli Alessandro Giannessi Dmitrij Popko Federico Gaio Jozef Kovalík Cristian Garín Enrique López Pérez Facundo Bagnis Ariel Behar6–2, 7–6(7) Simone Bolelli Alessandro Giannessi

Marzo SettimanaTorneoCampioniFinalistiSemifinalistiEliminati ai quarti5 marzo Zhuhai OpenZhuhai, Cina Challenger 80 – $75.000Cemento – 48S/4Q/16D Alex Bolt5–7, 7–6(4), 6–2 Hubert Hurkacz Jason Jung Oscar Otte Mats Moraing Kwon Soon-woo Jason Kubler Malek Jaziri Denys Molčanov Igor Zelenay7–5, 7–6(4) Aliaksandr Bury Peng Hsien-yin Santiago ChallengerSantiago del Cile, Cile Challenger 80 – $50.000+HTerra rossa – 48S/4Q/16D Marco Cecchinato1–6, 6–1, 6–1 Carlos Gómez-Herrera Jozef Kovalík Tommy Robredo Thomaz Bellucci Rogério Dutra da Silva Gian Marco Moroni Guido Andreozzi Romain Arneodo Jonathan Eysseric7–6(4), 1–6, [12–10] Guido Andreozzi Guillermo Durán12 marzo Irving Tennis ClassicIrving, Stati UnitiChallenger 125 – $150.000+HCemento – 32S/32Q/16D Mikhail Kukushkin6–2, 3–6, 6–1 Matteo Berrettini Márton Fucsovics Steve Johnson Mirza Bašić Petros Chrysochos Alex de Minaur Bjorn Fratangelo Philipp Petzschner Alexander Peya6–2, 6–4 Radu Albot Matthew EbdenPingshan OpenShenzhen, Cina Challenger 90 – $75.000+HCemento – 48S/4Q/16D Il'ja Ivaška6–4, 6–2 Zhang Ze Hubert Hurkacz Tatsuma Itō Malek Jaziri Viktor Galović Jürgen Zopp Salvatore Caruso Hsieh Cheng-peng Rameez Junaid7–6(3), 6–3 Denys Molčanov Igor Zelenay Challenger de DrummondvilleDrummondville, Canada Challenger 80 – $75.000Cemento indoor – 48S/4Q/16D Denis Kudla6–0, 7–5 Benjamin Bonzi Vasek Pospisil Brayden Schnur Evan King JC Aragone Frank Dancevic Jared Hiltzik Joris De Loore Frederik Nielsen6–4, 6–3 Luis David Martínez Filip Peliwo19 marzo Play In Challenger LilleLilla, Francia Challenger 80 – €43.000+HCemento indoor – 48S/4Q/16D Grégoire Barrère6–1, 6–4 Tobias Kamke Yannick Maden Maxime Janvier Guillermo Olaso David Guez Antoine Hoang Hugo Grenier Hugo Nys Tim Pütz7–6(3), 1–6, [10–7] Jeevan Nedunchezhiyan Purav RajaQujing International ChallengerQujing, China Challenger 80 – $75.000Cemento – 32S/32Q/16D Malek Jaziri7–6(5), 6–1 Blaž Rola Jason Kubler Alex Bolt Andrea Pellegrino Lorenzo Sonego Il'ja Ivaška Hubert Hurkacz Aljaksandr Bury Peng Hsien-yin6(3)–7, 6–4, [12–10] Wu Di Zhang Ze26 marzo Open Guadeloupe Le Gosier, Guadalupa Challenger 100 – €85.000+HCemento – 32S/15Q/16D Dušan Lajović6–4, 6–0 Denis Kudla Cristian Garín Ruben Bemelmans John-Patrick Smith Bradley Klahn Calvin Hemery Filip Peliwo Neal Skupski John-Patrick Smith7–6(3), 6–4 Ruben Bemelmans Jonathan Eysseric Andalucía ChallengerMarbella, Spagna Challenger 80 – €43.000+HTerra rossa – 48S/4Q/16D Stefano Travaglia6–3, 6–3 Guido Andreozzi Martin Kližan Marco Cecchinato Kimmer Coppejans Marco Trungelliti Ramkumar Ramanathan Simone Bolelli Guido Andreozzi Ariel Behar6–3, 6–4 Martin Kližan Jozef Kovalík San Luis Potosí ChallengerSan Luis Potosí, Messico Challenger 80 – $50.000+HTerra rossa – 48S/4Q/16D Marcelo Arévalo6–3, 6(3)–7, 6–4 Roberto Cid Subervi Pedro Sakamoto Daniel Elahi Galán José Hernández-Fernández Jay Clarke Gonzalo Escobar Jan Choinski Marcelo Arévalo Miguel Ángel Reyes Varela6–1, 6–4 Jay Clarke Kevin Krawietz Saint-Brieuc ChallengerSaint-Brieuc, FranciaChallenger 80 – €43.000+HCemento indoor – 32S/23Q/16D Ričardas Berankis6–2, 5–7, 6–4 Constant Lestienne Marcos Baghdatis Jürgen Zopp Matthias Bachinger Tobias Kamke Zdeněk Kolář Dennis Novak Sander Arends Tristan-Samuel Weissborn4–6, 6–1, [10–7] Luke Bambridge Joe Salisbury

Aprile