| Singles | |
|---|---|
| 2017 Båstad Challenger | |
| Champion |  Dušan Lajović |
| Runner-up |  Leonardo Mayer |
| Final score | 6–2, 7–6(7–4) |
Horacio Zeballos was the defending champion but chose not to defend his title.
Dušan Lajović won the title after defeating Leonardo Mayer 6–2, 7–6(7–4) in the final.
Dušan Lajović (champion) Renzo Olivo (quarterfinals)
Henri Laaksonen (quarterfinals) Facundo Bagnis (semifinals)
Casper Ruud (first round)
Arthur De Greef (second round)
Roberto Carballés Baena (second round) Guillermo García López (second round)| Semifinals | Final | ||||||||||||
| 1 | Dušan Lajović | 77 | 6 | ||||||||||
| 4 | Facundo Bagnis | 64 | 3 | ||||||||||
| 1 | Dušan Lajović | 6 | 77 | ||||||||||
| Leonardo Mayer | 2 | 64 | |||||||||||
| Leonardo Mayer | 6 | 6 | |||||||||||
| WC |  Mikael Ymer | 3 | 0 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | D Lajović | 4 | 6 | 6 | |||||||||||||||||||||||
| WC | M Eriksson | 6 | 4 | 2 | 1 | D Lajović | 6 | 6 | |||||||||||||||||||
| K Coppejans | 6 | 7 | K Coppejans | 2 | 3 | ||||||||||||||||||||||
 T Kamke | 3 | 5 | 1 | D Lajović | 6 | 7 | |||||||||||||||||||||
| WC | C Söderlund | 4 | 4 | WC | E Ymer | 3 | 5 | ||||||||||||||||||||
| WC | E Ymer | 6 | 6 | WC | E Ymer | 6 | 6 | ||||||||||||||||||||
| Q |  H Hurkacz | 6 | 3 | 3 | 6 | A De Greef | 3 | 1 | |||||||||||||||||||
| 6 | A De Greef | 4 | 6 | 6 | 1 | D Lajović | 77 | 6 | |||||||||||||||||||
| 4 | F Bagnis | 6 | 6 | 4 | F Bagnis | 64 | 3 | ||||||||||||||||||||
 M Bourgue | 3 | 2 | 4 | F Bagnis | 6 | 6 | |||||||||||||||||||||
| Alt | C Hemery | 65 | 6 | 5 |  J Domingues | 1 | 3 | ||||||||||||||||||||
| J Domingues | 77 | 4 | 7 | 4 | F Bagnis | 6 | 6 | ||||||||||||||||||||
 A Nedovyesov | 6 | 5 | 6 | A Nedovyesov | 2 | 2 | |||||||||||||||||||||
| S Robert | 2 | 7 | 4 | A Nedovyesov | 6 | 6 | |||||||||||||||||||||
| Q | F Simonsson | 3 | 2 | 8 | G García López | 2 | 4 | ||||||||||||||||||||
| 8 | G García López | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | C Ruud | 6 | 66 | 4 | |||||||||||||||||||||||
| L Mayer | 3 | 78 | 6 | L Mayer | 77 | 6 | |||||||||||||||||||||
 C Garin | 1 | 1 | F Krajinović | 65 | 3 | ||||||||||||||||||||||
| F Krajinović | 6 | 6 | L Mayer | 3 | 6 | 6 | |||||||||||||||||||||
| Alt | K Majchrzak | 4 | 6 | 6 | 3 | H Laaksonen | 6 | 3 | 2 | ||||||||||||||||||
| Q | JI Londero | 6 | 2 | 3 | Alt | K Majchrzak | 4 | 1 | |||||||||||||||||||
| T Lamasine | 1 | 4 | 3 | H Laaksonen | 6 | 6 | |||||||||||||||||||||
| 3 | H Laaksonen | 6 | 6 | L Mayer | 6 | 6 | |||||||||||||||||||||
| 7 | R Carballés Baena | 6 | 3 | WC | M Ymer | 3 | 0 | ||||||||||||||||||||
 R Bellotti | 0 | 0r | 7 | R Carballés Baena | 6 | 5 | 2 | ||||||||||||||||||||
| WC | M Ymer | 1 | 7 | 6 | WC | M Ymer | 4 | 7 | 6 | ||||||||||||||||||
| Í Cervantes | 6 | 5 | 3 | WC | M Ymer | 6 | 6 | ||||||||||||||||||||
| Q | I Arvidsson | 6 | 6 | 2 | R Olivo | 2 | 4 | ||||||||||||||||||||
 V Šafránek | 3 | 3 | Q | I Arvidsson | 5 | 63 | |||||||||||||||||||||
| T Robredo | 2 | 5 | 2 | R Olivo | 7 | 77 | |||||||||||||||||||||
| 2 | R Olivo | 6 | 7 | ||||||||||||||||||||||||
Juan Mónaco was the defending champion, but lost to Guillaume Rufin in the second round.
Horacio Zeballos won the title by defeating Rafael Nadal, in his return to the pro circuit, in the final, 6–7(2–7), 7–6(8–6), 6–4.
David Ferrer was the defending champion, and he successfully defended his title by defeating Stanislas Wawrinka in the final 6–4, 3–6, 6–1.
Marin Čilić was the defending champion, but withdrew with a knee injury before the tournament began.
Tommy Robredo won the title, defeating Fabio Fognini in the final, 6–0, 6–3.
Robin Haase was the two-time defending champion, but lost in the semifinals to Marcel Granollers. Granollers went on to win the title, defeating Juan Mónaco in the final, 0–6, 7–6(7–3), 6–4.
Defending champion Novak Djokovic successfully defended his title, defeating Roger Federer in the final, 6–4, 6–3, to win the men's singles title at the 2015 Italian Open. It was Djokovic's fourth Italian Open title, the second-most of all-time behind Rafael Nadal.
Roger Federer was the defending champion and successfully defended his title, defeating Rafael Nadal in the final, 6–3, 5–7, 6–3. This was his tenth consecutive final in a row in this event.
Viktor Troicki was the defending champion and successfully defended his title, defeating Grigor Dimitrov in the final, 2–6, 6–1, 7–6(9–7).
Andy Murray defeated John Isner in the final, 6–3, 6–7(4–7), 6–4, to win the singles title at the 2016 Paris Masters. By reaching the final, Murray clinched the world No. 1 ranking for the first time in his career.
Dominic Thiem was the defending champion, but chose to compete in Rotterdam instead.
Thiago Monteiro was the defending champion but chose not to defend his title.
Feliciano López was the defending champion, but lost in the second round to Yannick Hanfmann.
Andy Murray was the defending champion but withdrew with a hip injury before the tournament began.
Malek Jaziri was the defending champion but chose not to defend his title.
Two-time defending champion Rafael Nadal successfully defended his title, defeating Kei Nishikori in the final, 6–3, 6–2, to win the singles title at the 2018 Monte-Carlo Masters. It was his record-extending 11th Monte-Carlo Masters title and his record 31st ATP Masters title. By winning the title, Nadal also retained the ATP no. 1 singles ranking.
Alexander Zverev defeated Dominic Thiem in the final, 6–4, 6–4, to win the men's singles title at the 2018 Madrid Open.
Roger Federer was the defending champion and successfully defended his title, defeating Marius Copil in the final, 7–6(7–5), 6–4.
João Sousa was the defending champion, but lost in the second round to David Goffin.
Dominic Thiem was the defending champion, but he chose not to defend his title this year.
Marco Cecchinato was the defending champion, but lost in the first round to Aljaž Bedene.
Gaël Monfils was the defending champion, but chose not to defend his title.