| Singles | |
|---|---|
| 2024 AON Open Challenger | |
| 2023 Champion |  Thiago Seyboth Wild |
Thiago Seyboth Wild is the defending champion. [1]
| Singles | |
|---|---|
| 2024 AON Open Challenger | |
| 2023 Champion | Thiago Seyboth Wild |
Thiago Seyboth Wild is the defending champion. [1]
| Semifinals | Final | ||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | T Seyboth Wild | ||||||||||||||||||||||||||
| Q | |||||||||||||||||||||||||||
 S Travaglia | | ||||||||||||||||||||||||||
| Samuel Vincent Ruggeri | |||||||||||||||||||||||||||
| G Mager | |||||||||||||||||||||||||||
| Alt |  M Kližan | ||||||||||||||||||||||||||
| Q | |||||||||||||||||||||||||||
| 8 | A Pellegrino | ||||||||||||||||||||||||||
| 3 |  J Munar | ||||||||||||||||||||||||||
| Q | |||||||||||||||||||||||||||
| WC | Federico Bondioli | ||||||||||||||||||||||||||
| Q | |||||||||||||||||||||||||||
 K Nishikori | |||||||||||||||||||||||||||
| Q | |||||||||||||||||||||||||||
| WC | Gianluca Cadenasso | ||||||||||||||||||||||||||
| 7 |  JP Varillas | ||||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | S Napolitano | ||||||||||||||||||||||||||
| G Fonio | | ||||||||||||||||||||||||||
 A Andreev | |||||||||||||||||||||||||||
| Q | |||||||||||||||||||||||||||
| WC | J Berrettini | ||||||||||||||||||||||||||
| I Buse | |||||||||||||||||||||||||||
 D Popko | |||||||||||||||||||||||||||
| 4 |  DE Galán | ||||||||||||||||||||||||||
| 6 | F Passaro | ||||||||||||||||||||||||||
| F Arnaboldi | | ||||||||||||||||||||||||||
| G Bueno | |||||||||||||||||||||||||||
| Alt | Alexander Weis | ||||||||||||||||||||||||||
 B Hassan | |||||||||||||||||||||||||||
| F Maestrelli | |||||||||||||||||||||||||||
 G Debru | |||||||||||||||||||||||||||
| 2 | T Monteiro | ||||||||||||||||||||||||||
Kenneth Raisma and Stefanos Tsitsipas were the defending champions but both players were no longer eligible to participate in junior events.
Juan Carlos Aguilar and Felipe Meligeni Alves were the defending champions, but both players were ineligible to participate.
Ondřej Štyler and Naoki Tajima won the boys' doubles tennis title at the 2018 French Open, defeating Ray Ho and Tseng Chun-hsin in the final, 6–4, 6–4.
Wu Yibing was the defending champion, but was no longer eligible to participate in junior tournaments.
Hsu Yu-hsiou and Wu Yibing were the defending champions, but both players were no longer eligible to participate in junior tournaments.
David Marrero and Fernando Verdasco were the defending champions, but Verdasco chose not to defend the title and Marrero chose to compete in Marseille instead.
Fabio Fognini was the champion in 2014, when the event was last held, but chose to compete in Dubai instead.
Thiago Seyboth Wild was the defending champion but chose not to defend his title.
Diego Schwartzman defeated Francisco Cerúndolo in the final, 6–1, 6–2 to win the men's singles tennis title at the 2021 Argentina Open.
Cristian Garín defeated Facundo Bagnis in the final, 6–4, 6–7(3–7), 7–5 to capture the men's singles tennis title at the 2021 Chile Open.
Benoît Paire was the defending champion from when the event was last held in 2019, but chose to participate in Geneva instead.
Andrey Rublev was the defending champion, but chose to not defend his title as he and other Russian Olympic athletes were sent to Yuzhno-Sakhalinsk for training sessions.
Sumit Nagal was the defending champion but chose not to defend his title.
Hugo Dellien was the defending champion but lost in the quarterfinals to Juan Manuel Cerúndolo.
Casper Ruud defeated the defending champion Diego Schwartzman in the final, 5–7, 6–2, 6–3 to win the singles title at the 2022 Argentina Open.
Francisco Comesaña was the defending champion but lost in the second round to Andrea Collarini.
Arklon and Conner Huertas del Pino were the defending champions but lost in the semifinals to Francisco Comesaña and Thiago Seyboth Wild.
Alexander Zverev defeated Laslo Djere in the final, 7–5, 6–3 to win the men's singles tennis title at the 2023 Hamburg European Open in his hometown of Hamburg.
Cedrik-Marcel Stebe was the defending champion but chose not to defend his title.
Thiago Monteiro was the defending champion but lost in the semifinals to Fabio Fognini.