| Singles | |
|---|---|
| 2023 Open de Oeiras II | |
| Champion |  Facundo Díaz Acosta |
| Runner-up |  Aleksandar Vukic |
| Score | 6–4, 6–3 |
Zsombor Piros was the defending champion [1] but chose not to defend his title.
Facundo Díaz Acosta won the title after defeating Aleksandar Vukic 6–4, 6–3 in the final.
Pedro Cachin (quarterfinals)
Hugo Gaston (first round, retired)
Radu Albot (quarterfinals)
Emilio Gómez (first round) Facundo Bagnis (first round) Aleksandar Vukic (final) Facundo Díaz Acosta (champion) Rinky Hijikata (first round)| Semifinals | Final | ||||||||||||
 Nicolas Moreno de Alboran | 69 | 2 | |||||||||||
| 7 | Facundo Díaz Acosta | 711 | 6 | ||||||||||
| 7 | Facundo Díaz Acosta | 6 | 6 | ||||||||||
| 6 | Aleksandar Vukic | 4 | 3 | ||||||||||
| 6 | Aleksandar Vukic | 5 | 6 | 6 | |||||||||
 Felipe Meligeni Alves | 7 | 4 | 4 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | P Cachin | 5 | 77 | 6 | |||||||||||||||||||||||
| Q | E Ribeiro | 7 | 65 | 3 | 1 | P Cachin | 6 | 6 | |||||||||||||||||||
 H Dellien | 6 | 6 | H Dellien | 4 | 2 | ||||||||||||||||||||||
 I Gakhov | 1 | 3 | 1 | P Cachin | 1 | 4 | |||||||||||||||||||||
| N Moreno de Alboran | 6 | 2 | 6 | N Moreno de Alboran | 6 | 6 | |||||||||||||||||||||
| Alt | F Delbonis | 2 | 6 | 1 | N Moreno de Alboran | 6 | 6 | ||||||||||||||||||||
| S Johnson | 1 | 77 | 6 | S Johnson | 3 | 0 | |||||||||||||||||||||
| 8 | R Hijikata | 6 | 63 | 1 | N Moreno de Alboran | 69 | 2 | ||||||||||||||||||||
| 3 | R Albot | 6 | 6 | 7 | F Díaz Acosta | 711 | 6 | ||||||||||||||||||||
| Alt |  A Andreev | 1 | 3 | 3 | R Albot | 77 | 6 | ||||||||||||||||||||
 J Choinski | 6 | 4 | 6 | J Choinski | 63 | 4 | |||||||||||||||||||||
| Q |  A Giannessi | 3 | 6 | 4 | 3 | R Albot | 2 | 2 | |||||||||||||||||||
| Q | U Blanch | 6 | 77 | 7 | F Díaz Acosta | 6 | 6 | ||||||||||||||||||||
| WC |  P Sousa | 2 | 64 | Q | U Blanch | 4 | 5 | ||||||||||||||||||||
| Em Nava | 1 | 63 | 7 | F Díaz Acosta | 6 | 7 | |||||||||||||||||||||
| 7 | F Díaz Acosta | 6 | 77 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | A Vukic | 77 | 6 | ||||||||||||||||||||||||
| WC | F Ferreira Silva | 63 | 3 | 6 | A Vukic | 6 | 4 | 6 | |||||||||||||||||||
 Gerard Campana Lee | 6 | 6 | G Campana Lee | 4 | 6 | 3 | |||||||||||||||||||||
| Q | M Guinard | 3 | 2 | 6 | A Vukic | 7 | 6 | ||||||||||||||||||||
 M Landaluce | 5 | 1 |  A Ritschard | 5 | 3 | ||||||||||||||||||||||
| A Ritschard | 7 | 6 | A Ritschard | 6 | 6 | ||||||||||||||||||||||
| Q |  M Valkusz | 6 | 6 | Q | M Valkusz | 3 | 0 | ||||||||||||||||||||
| 4 | E Gómez | 0 | 1 | 6 | A Vukic | 5 | 6 | 6 | |||||||||||||||||||
| 5 | F Bagnis | 4 | 4 | F Meligeni Alves | 7 | 4 | 4 | ||||||||||||||||||||
 O Krutykh | 6 | 6 | O Krutykh | 62 | 64 | ||||||||||||||||||||||
| F Meligeni Alves | 6 | 6 | F Meligeni Alves | 77 | 77 | ||||||||||||||||||||||
| R Brancaccio | 1 | 2 | F Meligeni Alves | 7 | 6 | ||||||||||||||||||||||
| WC | J Domingues | 6 | 0 | 2 | P Martínez | 5 | 3 | ||||||||||||||||||||
| Q |  N Serdarušić | 4 | 6 | 6 | Q | N Serdarušić | 3 | 65 | |||||||||||||||||||
| P Martínez | 6 | 3 | P Martínez | 6 | 77 | ||||||||||||||||||||||
| 2 | H Gaston | 3 | 0r | ||||||||||||||||||||||||
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Axel Geller and Hsu Yu-hsiou were the defending champions, but both players were ineligible to participate in junior events.
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Mitchell Krueger was the defending champion but lost in the first round to Keegan Smith.
Jason Jung was the defending champion but lost in the second round to Maximilian Marterer.
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Guillermo Durán and Nicolás Mejía were the defending champions but chose not to defend their title.
Jesper de Jong and Bart Stevens were the defending champions but only de Jong chose to defend his title, partnering Max Houkes. De Jong and Houkes retired from their first round match against Boris Arias and Federico Zeballos.
Arthur Rinderknech was the defending champion but chose not to defend his title.
Hugo Dellien was the defending champion and successfully defended his title after defeating Thiago Seyboth Wild 3–6, 6–3, 6–3 in the final.
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Kaichi Uchida was the defending champion but lost in the quarterfinals to Juan Manuel Cerúndolo.
Jack Sock was the defending champion but chose not to defend his title.
Zsombor Piros was the defending champion but chose not to defend his title.
The 2023 French Open – Men's singles qualifying are a series of tennis matches that take place from 22 to 26 May 2023 to determine the qualifiers for the 2023 French Open – Men's singles, and, if necessary, the lucky losers.
Vít Kopřiva was the defending champion but lost in the first round to Máté Valkusz.
Federico Coria was the defending champion but chose not to defend his title.
Zsombor Piros was the defending champion but lost in the second round to Henri Squire.