# 2023 Good to Great Challenger – Singles

This was the first edition of the tournament.
Maximilian Marterer won the title after defeating Brandon Nakashima 2–6, 6–4, 6–3 in the final.

## Seeds

* Hugo Gaston (first round)
* Maximilian Marterer (champion)
* Flavio Cobolli (semifinals)
* David Goffin (quarterfinals)
* Hamad Medjedovic (second round)
* Maxime Cressy (quarterfinals)
* Radu Albot (quarterfinals)
* Brandon Nakashima (final)

## 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 | Final | Final | Final | Final | Final |
| Q | Alexander Blockx | 1 | 2 | | | | | |
| 8 | Brandon Nakashima | 6 | 6 | | | | | |
| 8 | Brandon Nakashima | 6 | 6 | 8 | Brandon Nakashima | 6 | 4 | 3 |
| | | | | 2 | Maximilian Marterer | 2 | 6 | 6 |
| 3 | Flavio Cobolli | 2 | 0 | 2 | Maximilian Marterer | 2 | 6 | 6 |
| 2 | Maximilian Marterer | 6 | 6 | | | | | |

### Top 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | H Gaston | 6 | 4 | 4 | | | | | | | | | | | | | |
| | C Moutet | 2 | 6 | 6 | | C Moutet | 6$^6$ | 1 | | | | | | | | | |
| Q | A Blockx | 3 | 6 | 7$^7$ | Q | A Blockx | 7$^8$ | 6 | | | | | | | | | |
| Q | M Neuchrist | 6 | 1 | 6$^3$ | | | | | | Q | A Blockx | 6 | 6 | | | | |
| | J Menšík | 6 | 7$^7$ | | | | | | | | J Menšík | 3 | 0 | | | | |
| WC | M Dahlin | 2 | 6$^3$ | | | J Menšík | 4 | 7$^7$ | 7$^{10}$ | | | | | | | | |
| | S Travaglia | 4 | 3 | | 5 | H Medjedovic | 6 | 6$^2$ | 6$^8$ | | | | | | | | |
| 5 | H Medjedovic | 6 | 6 | | | | | | | | | | | Q | A Blockx | 1 | 2 |
| 4 | D Goffin | 6 | 6 | | | | | | | | | | | 8 | B Nakashima | 6 | 6 |
| Q | M Möller | 3 | 2 | | 4 | D Goffin | 7 | 7 | | | | | | | | | |
| | L Riedi | 6$^2$ | 6 | 4 | Q | A Kachmazov | 5 | 5 | | | | | | | | | |
| Q | A Kachmazov | 7$^7$ | 2 | 6 | | | | | | 4 | D Goffin | 2 | 6$^2$ | | | | |
| | D Yevseyev | 6 | 6 | | | | | | | 8 | B Nakashima | 6 | 7$^7$ | | | | |
| WC | K Friberg | 2 | 3 | | | D Yevseyev | 4 | 2 | | | | | | | | | |
| | J Choinski | 4 | 2 | | 8 | B Nakashima | 6 | 6 | | | | | | | | | |
| 8 | B Nakashima | 6 | 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 |
| 7 | R Albot | 4 | 6 | 6 | | | | | | | | | | | | | | |
| | F Passaro | 6 | 3 | 4 | 7 | R Albot | 6 | 6 | | | | | | | | | | |
| | M Kukushkin | 2 | 1 | | Alt | O Krutykh | 4 | 2 | | | | | | | | | | |
| Alt | O Krutykh | 6 | 6 | | | | | | | 7 | R Albot | 4 | 6$^5$ | | | | | |
| WC | L Borg | 6 | 4 | 0 | | | | | | 3 | F Cobolli | 6 | 7$^7$ | | | | | |
| | G Onclin | 2 | 6 | 6 | | G Onclin | | | | | | | | | | | | |
| | GA Bailly | 4 | 1 | | 3 | F Cobolli | w/o | | | | | | | | | | | |
| 3 | F Cobolli | 6 | 6 | | | | | | | | | | | | 3 | F Cobolli | 2 | 0 |
| 6 | M Cressy | 6 | 7$^7$ | | | | | | | | | | | | 2 | M Marterer | 6 | 6 |
| | J De Loore | 3 | 6$^1$ | | 6 | M Cressy | 6 | 6$^5$ | 7 | | | | | | | | | |
| Q | E Møller | 4 | 1 | | | D Džumhur | 3 | 7$^7$ | 5 | | | | | | | | | |
| | D Džumhur | 6 | 6 | | | | | | | 6 | M Cressy | 4 | 6 | 1 | | | | |
| | A Fery | 6 | 2 | 6 | | | | | | 2 | M Marterer | 6 | 4 | 6 | | | | |
| Q | M Brunold | 4 | 6 | 2 | | A Fery | 6$^5$ | 1 | | | | | | | | | | |
| | O Otte | 3 | 0 | | 2 | M Marterer | 7$^7$ | 6 | | | | | | | | | | |
| 2 | M Marterer | 6 | 6 | | | | | | | | | | | | | | | |