| Singles | |
|---|---|
| 2018 Internazionali di Tennis Castel del Monte | |
| Champion |  Ugo Humbert |
| Runner-up |  Filippo Baldi |
| Final score | 6–4, 7–6(7–3) |
Uladzimir Ignatik was the defending champion but lost in the second round to Ugo Humbert.
Humbert won the title after defeating Filippo Baldi 6–4, 7–6(7–3) in the final.
Ugo Humbert (champion) Lorenzo Sonego (second round) Paolo Lorenzi (second round)
Adrián Menéndez Maceiras (first round)
Sergiy Stakhovsky (quarterfinals) Quentin Halys (semifinals) Corentin Moutet (second round) Filippo Baldi (final)| Semifinals | Final | ||||||||||||
| 1 | Ugo Humbert | 6 | 6 | ||||||||||
 Kevin Krawietz | 3 | 2 | |||||||||||
| 1 | Ugo Humbert | 6 | 77 | ||||||||||
| 8 | Filippo Baldi | 4 | 63 | ||||||||||
| 6 | Quentin Halys | 4 | 4 | ||||||||||
| 8 | Filippo Baldi | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | U Humbert | 77 | 6 | ||||||||||||||||||||||||
 G Oliveira | 64 | 3 | 1 | U Humbert | 78 | 6 | |||||||||||||||||||||
 Z Kolář | 64 | 3 |  U Ignatik | 66 | 3 | ||||||||||||||||||||||
| U Ignatik | 77 | 6 | 1 | U Humbert | 6 | 6 | |||||||||||||||||||||
| WC | L Caruana | 6 | 65 | 7 | 5 | S Stakhovsky | 0 | 4 | |||||||||||||||||||
| LL |  A Erler | 1 | 77 | 5 | WC | L Caruana | 4 | 0 | |||||||||||||||||||
| M Viola | 1 | 5 | 5 | S Stakhovsky | 6 | 6 | |||||||||||||||||||||
| 5 | S Stakhovsky | 6 | 7 | 1 | U Humbert | 6 | 6 | ||||||||||||||||||||
| 4 | A Menéndez Maceiras | 65 | 610 | K Krawietz | 3 | 2 | |||||||||||||||||||||
| LL |  M-A Hüsler | 77 | 712 | LL | M-A Hüsler | 7 | 3 | 61 | |||||||||||||||||||
| K Krawietz | 77 | 77 | K Krawietz | 5 | 6 | 77 | |||||||||||||||||||||
| G Mager | 63 | 65 | K Krawietz | 77 | 4 | 77 | |||||||||||||||||||||
| F Gaio | 6 | 4 | 6 | F Gaio | 64 | 6 | 65 | ||||||||||||||||||||
| A Davidovich Fokina | 2 | 6 | 4 | F Gaio | 7 | 6 | |||||||||||||||||||||
| Alt | A Bega | 3 | 3 | 7 | C Moutet | 5 | 3 | ||||||||||||||||||||
| 7 | C Moutet | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | Q Halys | 3 | 6 | 6 | |||||||||||||||||||||||
 V Galović | 6 | 3 | 4 | 6 | Q Halys | 6 | 77 | ||||||||||||||||||||
| R Brancaccio | 3 | 5 |  L Grigelis | 3 | 63 | ||||||||||||||||||||||
| L Grigelis | 6 | 7 | 6 | Q Halys | 3 | ||||||||||||||||||||||
| R Marcora | 7 | 1 | 77 | R Marcora | 1r | ||||||||||||||||||||||
| Q | Lorenzo Frigerio | 5 | 6 | 64 | R Marcora | 6 | 79 | ||||||||||||||||||||
| WC | A Pellegrino | 4 | 2 | 3 | P Lorenzi | 3 | 67 | ||||||||||||||||||||
| 3 | P Lorenzi | 6 | 6 | 6 | Q Halys | 4 | 4 | ||||||||||||||||||||
| 8 | F Baldi | 6 | 78 | 8 | F Baldi | 6 | 6 | ||||||||||||||||||||
| Y Jankovits | 3 | 66 | 8 | F Baldi | 78 | 6 | |||||||||||||||||||||
| WC | J Ocleppo | 4 | 4 | Q |  A Šetkić | 66 | 4 | ||||||||||||||||||||
| Q | A Šetkić | 6 | 6 | 8 | F Baldi | 6 | 2 | 7 | |||||||||||||||||||
| WC | J Sinner | 6 | 2 | 4 | Q | I Marchenko | 2 | 6 | 5 | ||||||||||||||||||
| Q | I Marchenko | 4 | 6 | 6 | Q | I Marchenko | 6 | 6 | |||||||||||||||||||
| Q | Tobias Simon | 61 | 7 | 5 | 2 | L Sonego | 4 | 4 | |||||||||||||||||||
| 2 | L Sonego | 77 | 5 | 7 | |||||||||||||||||||||||
Nick Kyrgios defeated Thanasi Kokkinakis in the final, 7–6(7–4), 6–3 to win the boys' singles tennis title at the 2013 Australian Open.
Jake Delaney and Marc Polmans were the defending champions, however both players were no longer eligible to play juniors.
Yannick Hanfmann was the defending champion but chose not to defend his title.
Quentin Halys was the defending champion but lost in the second round to Dan Evans.
Maximilian Marterer was the defending champion but chose not to defend his title.
João Sousa was the defending champion, but lost in the second round to David Goffin.
Hugo Dellien was the defending champion but chose not to defend his title.
Damir Džumhur was the defending champion, but retired from his quarterfinal match against Jordan Thompson.
Steve Johnson was the defending champion, but lost in the first round to Christopher Eubanks.
Matteo Berrettini was the defending champion, but withdrew with an ankle injury before the tournament began.
John Isner was the two-time defending champion and had won the title five times in the last six years, but he lost in the second round to Reilly Opelka. This was only the second time out of ten in the Atlanta Open's history that Isner failed to reach the singles final.
Filippo Baldi was the defending champion but lost in the third round to Lukáš Lacko.
Hubert Hurkacz was the defending champion but chose not to defend his title.
Ugo Humbert was the defending champion but chose not to defend his title.
Gaël Monfils was the defending champion, but chose not to defend his title.
Ugo Humbert defeated Andrey Rublev in the final 6–3, 7–6(7–4), to win the singles tennis title at the 2021 Halle Open. Humbert's win earned him his third career ATP Tour singles title and his first ATP 500 victory, and also made him the first French player to win the tournament since Henri Leconte won the inaugural edition in 1993. Both Humbert and Rublev were contesting their first career final on grass.
Jo-Wilfried Tsonga was the reigning champion from when the tournament was last held in 2019, but chose not to participate this year.
Ugo Humbert was the defending champion, but chose not to participate this year.
Matteo Berrettini defeated Andy Murray in the final, 6–4, 5–7, 6–3 to win the singles tennis title at the 2022 Stuttgart Open.
Marc-Andrea Hüsler defeated Holger Rune in the final, 6–4, 7–6(10–8) to win the singles tennis title at the 2022 Sofia Open. It was his maiden ATP Tour title, and he saved two match points en route, in his quarterfinal match against Kamil Majchrzak. Hüsler became the fourth Swiss man, after Roger Federer, Stan Wawrinka and Marc Rosset, to win an ATP Tour title in the 21st century.