| Men's singles | |
|---|---|
| 2023 Lisboa Belém Open | |
| 2022 Champion |  Marco Cecchinato |
Marco Cecchinato was the defending champion [1] but chose not to defend his title.
| Men's singles | |
|---|---|
| 2023 Lisboa Belém Open | |
| 2022 Champion | Marco Cecchinato |
Marco Cecchinato was the defending champion [1] but chose not to defend his title.
Albert Ramos Viñolas (semifinals) Flavio Cobolli 
Timofey Skatov (first round) Pablo Llamas Ruiz (second round)
Ivan Gakhov (second round)
Titouan Droguet (first round)
Zdeněk Kolář (first round) Matteo Gigante (first round)| Semifinals | Final | ||||||||||||
| 1 | Albert Ramos Viñolas | 3 | 3 | ||||||||||
 Benjamin Hassan | 6 | 6 | |||||||||||
| Benjamin Hassan | |||||||||||||
| 2 | Flavio Cobolli | ||||||||||||
| Franco Agamenone | 4 | 1 | |||||||||||
| 2 | Flavio Cobolli | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Ramos Viñolas | 6 | 3 | 6 | |||||||||||||||||||||||
| LL |  H Laaksonen | 4 | 6 | 2 | 1 | A Ramos Viñolas | 79 | 6 | |||||||||||||||||||
| WC |  G Elias | 6 | 6 | WC | G Elias | 67 | 4 | ||||||||||||||||||||
 N Fatić | 2 | 2 | 1 | A Ramos Viñolas | 6 | 6 | |||||||||||||||||||||
| WC | J Sousa | 6 | 7 | WC | J Sousa | 4 | 2 | ||||||||||||||||||||
| LL | H Rocha | 2 | 5 | WC | J Sousa | 6 | 6 | ||||||||||||||||||||
| WC | P Sousa | 6 | 6 | WC | P Sousa | 2 | 3 | ||||||||||||||||||||
| 6 | T Droguet | 4 | 4 | 1 | A Ramos Viñolas | 3 | 3 | ||||||||||||||||||||
| 4 | P Llamas Ruiz | 6 | 6 | B Hassan | 6 | 6 | |||||||||||||||||||||
| A Giannessi | 3 | 1 | 4 | P Llamas Ruiz | 4 | 62 | |||||||||||||||||||||
| Q | J Barranco Cosano | 3 | 4 | SE | O Roca Batalla | 6 | 77 | ||||||||||||||||||||
| SE | O Roca Batalla | 6 | 6 | SE | O Roca Batalla | 61 | 4 | ||||||||||||||||||||
| Q | F Forti | 6 | 1 | 3 | B Hassan | 77 | 6 | ||||||||||||||||||||
| B Hassan | 3 | 6 | 6 | B Hassan | 7 | 6 | |||||||||||||||||||||
| G Blancaneaux | 4 | 2 | 5 | I Gakhov | 5 | 1 | |||||||||||||||||||||
| 5 | I Gakhov | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | M Gigante | 4 | 64 | ||||||||||||||||||||||||
| F Agamenone | 6 | 77 | F Agamenone | 77 | 6 | ||||||||||||||||||||||
| S Travaglia | 6 | 2 | 61 | Q |  L Mikrut | 64 | 3 | ||||||||||||||||||||
| Q | L Mikrut | 1 | 6 | 77 | F Agamenone | 77 | 7 | ||||||||||||||||||||
 M Valkusz | 6 | 64 | 0r | R Bonadio | 65 | 5 | |||||||||||||||||||||
| Edoardo Lavagno | 3 | 77 | 0 | E Lavagno | 6 | 3 | 2 | ||||||||||||||||||||
| R Bonadio | 6 | 6 | R Bonadio | 3 | 6 | 6 | |||||||||||||||||||||
| 3 | T Skatov | 4 | 3 | F Agamenone | 4 | 1 | |||||||||||||||||||||
| 7 | Z Kolář | 4 | 3 | 2 | F Cobolli | 6 | 6 | ||||||||||||||||||||
 G-A Bailly | 6 | 6 | G-A Bailly | 5 | 77 | 1 | |||||||||||||||||||||
| Q | Alexander Weis | 1 | 3 | C Hemery | 7 | 64 | 6 | ||||||||||||||||||||
| C Hemery | 6 | 6 | C Hemery | 4 | 3 | ||||||||||||||||||||||
| Q |  O Krutykh | 5 | 6 | 6 | 2 | F Cobolli | 6 | 6 | |||||||||||||||||||
 Gerard Campana Lee | 7 | 2 | 3 | Q | O Krutykh | 62 | 3 | ||||||||||||||||||||
| Q | Enrico Dalla Valle | 4 | 7 | 0 | 2 | F Cobolli | 77 | 6 | |||||||||||||||||||
| 2 | F Cobolli | 6 | 5 | 6 | |||||||||||||||||||||||
Marin Čilić was the defending champion and successfully defended his title, defeating Tommy Haas in the final, 6–3, 6–4.
Matheus Pucinelli de Almeida and Thiago Agustín Tirante won the boys' doubles tennis title at the 2019 French Open, defeating Flavio Cobolli and Dominic Stricker in the final, 7–6(7–3), 6–4.
Holger Rune was the defending champion, but he chose not to participate.
Matheus Pucinelli de Almeida and Thiago Agustín Tirante were the defending champions, but both players were no longer eligible to participate in junior events.
Andrea Pellegrino was the defending champion but lost in the quarterfinals to Flavio Cobolli.
In the 2021 French Open – Boys' doubles, Flavio Cobolli and Dominic Stricker were the defending champions, but both players were no longer eligible to participate in junior events.
Andrey Rublev defeated Félix Auger-Aliassime in the final, 7–5, 7–6(7–4) to win the singles title at the 2022 Open 13 Provence.
Nikola Milojević was the defending champion but lost in the first round to Eduard Esteve Lobato.
Andrey Rublev defeated Novak Djokovic in the final, 6–2, 6–7(4–7), 6–0 to win the singles tennis title at the 2022 Serbia Open.
Holger Rune was the defending champion but chose not to defend his title.
Jannik Sinner defeated the defending champion Carlos Alcaraz in the final, 6–7(5–7), 6–1, 6–1 to win the singles tennis title at the 2022 Croatia Open Umag.
Francisco Cerúndolo was the defending champion but chose not to defend his title.
Holger Rune was the defending champion but chose not to defend his title.
Félix Auger-Aliassime defeated J. J. Wolf in the final, 6–4, 6–4 to win the singles tennis title at the 2022 Firenze Open. It was his second ATP Tour singles title.
Oscar Otte was the defending champion but chose not to defend his title.
Tallon Griekspoor defeated Benjamin Bonzi in the final, 4–6, 7–5, 6–3 to win the singles tennis title at the 2023 Maharashtra Open. It was his maiden ATP Tour singles title.
Tallon Griekspoor was the defending champion but chose not to defend his title.
Evgenii Tiurnev was the defending champion but chose not to defend his title.
Flavio Cobolli was the defending champion but lost in the semifinals to Sebastian Ofner.
Cedrik-Marcel Stebe was the defending champion but chose not to defend his title.