# 2023 Curitiba Challenger – Singles

Agustín Velotti was the defending champion from when the tournament was last held in 2016 but didn't defend his title as he retired from professional tennis.
Hugo Dellien won the title after defeating Oliver Crawford 7–6$^{(8–6)}$, 4–6, 7–6$^{(7–1)}$ in the final.

## Seeds

* Juan Manuel Cerúndolo (first round)
* Thiago Agustín Tirante (second round)
* Francisco Comesaña (second round)
* Vít Kopřiva (first round)
* Hugo Dellien (champion)
* Felipe Meligeni Alves (second round)
* Mariano Navone (withdrew)
* Camilo Ugo Carabelli (second round)
* Luciano Darderi (semifinals)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 5 | Hugo Dellien | 6$^5$ | 6 | 6 | | | | | |
| | Guido Andreozzi | 7$^7$ | 2 | 3 | | | | | |
| | Guido Andreozzi | 7$^7$ | 2 | 3 | 5 | Hugo Dellien | 7$^8$ | 4 | 7$^7$ |
| | | | | | | Oliver Crawford | 6$^6$ | 6 | 6$^1$ |
| 9 | Luciano Darderi | 2 | 3 | | | Oliver Crawford | 6$^6$ | 6 | 6$^1$ |
| | Oliver Crawford | 6 | 6 | | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | JM Cerúndolo | 3 | 5 | | | | | | | | | | | | | | |
| WC | Wilson Leite | 6 | 7 | | WC | W Leite | 6$^3$ | 4 | | | | | | | | | |
| Q | M Alves | 7$^7$ | 3 | 4 | | S Rodríguez Taverna | 7$^7$ | 6 | | | | | | | | | |
| | S Rodríguez Taverna | 6$^2$ | 6 | 6 | | | | | | S Rodríguez Taverna | 2 | 3 | | | | | |
| | JL Reis da Silva | 6 | 6 | | | | | | 5 | H Dellien | 6 | 6 | | | | | |
| Q | A Huertas del Pino | 4 | 4 | | | JL Reis da Silva | 2 | 3 | | | | | | | | | |
| | E Ribeiro | 4 | 4 | | 5 | H Dellien | 6 | 6 | | | | | | | | | |
| 5 | H Dellien | 6 | 6 | | | | | | | | | | 5 | H Dellien | 6$^5$ | 6 | 6 |
| 4 | V Kopřiva | 0 | 6$^4$ | | | | | | | | | | | G Andreozzi | 7$^7$ | 2 | 3 |
| | L Neumayer | 6 | 7$^7$ | | | L Neumayer | 5 | 3 | | | | | | | | | |
| | RA Burruchaga | 6 | 6 | | | RA Burruchaga | 7 | 6 | | | | | | | | | |
| WC | Gustavo Ribeiro de Almeida | 4 | 1 | | | | | | | RA Burruchaga | 4 | 5 | | | | | |
| Q | Gilbert Klier Júnior | 2 | 0 | | | | | | | G Andreozzi | 6 | 7 | | | | | |
| | G Andreozzi | 6 | 6 | | | G Andreozzi | 6 | 7$^7$ | | | | | | | | | |
| Q | D Dutra da Silva | 6$^6$ | 1 | | 8 | C Ugo Carabelli | 2 | 6$^4$ | | | | | | | | | |
| 8 | C Ugo Carabelli | 7$^8$ | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 9 | L Darderi | 6$^5$ | 6 | 6 | | | | | | | | | | | | | | |
| | JP Ficovich | 7$^7$ | 2 | 1 | 9 | L Darderi | 6 | 6 | | | | | | | | | | |
| Q | P Boscardin Dias | 6$^5$ | 2 | | | R Olivo | 4 | 4 | | | | | | | | | | |
| | R Olivo | 7$^7$ | 6 | | | | | | | 9 | L Darderi | 6 | 6 | | | | | |
| WC | O Luz | 6 | 7 | | | | | | | WC | O Luz | 4 | 0 | | | | | |
| | M Dellien | 1 | 5 | | WC | O Luz | 6 | 6 | | | | | | | | | | |
| Q | Nicolas Zanellato | 4 | 4 | | 3 | F Comesaña | 1 | 4 | | | | | | | | | | |
| 3 | F Comesaña | 6 | 6 | | | | | | | | | | | | 9 | L Darderi | 2 | 3 |
| 6 | F Meligeni Alves | 7$^8$ | 6 | | | | | | | | | | | | | O Crawford | 6 | 6 |
| | B Kuzuhara | 6$^6$ | 4 | | 6 | F Meligeni Alves | 6 | 5 | 4 | | | | | | | | | |
| | O Crawford | 6 | 6 | | | O Crawford | 3 | 7 | 6 | | | | | | | | | |
| | JB Torres | 1 | 3 | | | | | | | | O Crawford | 7$^8$ | 2 | 6 | | | | |
| Alt | C Taberner | 2 | 6 | 6$^6$ | | | | | | | D Svrčina | 6$^6$ | 6 | 1 | | | | |
| | D Svrčina | 6 | 2 | 7$^8$ | | D Svrčina | 6 | 7$^8$ | | | | | | | | | | |
| | M Pucinelli de Almeida | 2 | 6 | 1 | 2 | TA Tirante | 4 | 6$^6$ | | | | | | | | | | |
| 2 | TA Tirante | 6 | 3 | 6 | | | | | | | | | | | | | | |