# 2023 San Luis Open Challenger – Men's singles

Antoine Bellier was the defending champion but lost in the first round to Alexis Galarneau.
Tomás Barrios Vera won the title after defeating Dominik Koepfer 7–6$^{(8–6)}$, 7–5 in the final.

## Seeds

* James Duckworth (first round)
* Antoine Bellier (first round)
* Tomás Barrios Vera (champion)
* Renzo Olivo (second round, retired)
* Facundo Mena (first round)
* Rio Noguchi (first round)
* Juan Pablo Ficovich (first round)
* Nick Hardt (first round)

## 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 |
| | Jan Choinski | 3 | 3 | | | | |
| | Dominik Koepfer | 6 | 6 | | | | |
| | Dominik Koepfer | 6 | 6 | | Dominik Koepfer | 6$^6$ | 5 |
| | | | | 3 | Tomás Barrios Vera | 7$^8$ | 7 |
| 3 | Tomás Barrios Vera | 6 | 6 | 3 | Tomás Barrios Vera | 7$^8$ | 7 |
| Q | Patrick Kypson | 4 | 3 | | | | |

### 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 |
| 1 | J Duckworth | 6$^4$ | 6 | 3 | | | | | | | | | | | |
| | TA Tirante | 7$^7$ | 4 | 6 | | TA Tirante | 6 | 6 | | | | | | | |
| | A Dougaz | 2 | 2 | | | F Comesaña | 2 | 3 | | | | | | | |
| | F Comesaña | 6 | 6 | | | | | | TA Tirante | 4 | 4 | | | | |
| | JL Reis da Silva | 6 | 3 | 6 | | | | | J Choinski | 6 | 6 | | | | |
| | A Walton | 1 | 6 | 4 | | JL Reis da Silva | 5 | 5 | | | | | | | |
| | J Choinski | 4 | 7 | 6 | | J Choinski | 7 | 7 | | | | | | | |
| 5 | F Mena | 6 | 5 | 2 | | | | | | | | | J Choinski | 3 | 3 |
| 4 | R Olivo | 7 | 6 | | | | | | | | | | D Koepfer | 6 | 6 |
| Q | R Statham | 5 | 3 | | 4 | R Olivo | 4 | 1$^r$ | | | | | | | |
| | J Jung | 0 | 6$^3$ | | | M Neuchrist | 6 | 4 | | | | | | | |
| | M Neuchrist | 6 | 7$^7$ | | | | | | M Neuchrist | 6 | 1 | 4 | | | |
| | RA Burruchaga | 1 | 3 | | | | | | D Koepfer | 4 | 6 | 6 | | | |
| | D Koepfer | 6 | 6 | | | D Koepfer | 6 | 6 | | | | | | | |
| Q | D Yevseyev | 7 | 7$^7$ | | Q | D Yevseyev | 3 | 2 | | | | | | | |
| 8 | N Hardt | 5 | 6$^1$ | | | | | | | | | | | | |

### 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 | JP Ficovich | 6$^4$ | 3 | | | | | | | | | | | | | | | |
| Q | G Mpetshi Perricard | 7$^7$ | 6 | | Q | G Mpetshi Perricard | 7$^7$ | 6 | | | | | | | | | | |
| | N Mejía | 4 | 6$^5$ | | | M Dellien | 6$^4$ | 3 | | | | | | | | | | |
| | M Dellien | 6 | 7$^7$ | | | | | | | Q | G Mpetshi Perricard | 4 | 6 | 4 | | | | |
| | Elmar Ejupovic | 6 | 6 | | | | | | | 3 | T Barrios Vera | 6 | 4 | 6 | | | | |
| WC | L Pouille | 3 | 3 | | | E Ejupovic | 6 | 0 | 6$^4$ | | | | | | | | | |
| Q | N Chappell | 6$^5$ | 1 | | 3 | T Barrios Vera | 3 | 6 | 7$^7$ | | | | | | | | | |
| 3 | T Barrios Vera | 7$^7$ | 6 | | | | | | | | | | | | 3 | T Barrios Vera | 6 | 6 |
| 6 | R Noguchi | 2 | 6$^5$ | | | | | | | | | | | | Q | P Kypson | 4 | 3 |
| WC | R Pacheco Méndez | 6 | 7$^7$ | | WC | R Pacheco Méndez | 3 | 3 | | | | | | | | | | |
| | AD Vallejo | 1 | 3 | | Q | P Kypson | 6 | 6 | | | | | | | | | | |
| Q | P Kypson | 6 | 6 | | | | | | | Q | P Kypson | 6 | 6$^5$ | 6 | | | | |
| Q | B Lock | 6 | 3 | 5 | | | | | | | T Atmane | 2 | 7$^7$ | 2 | | | | |
| | T Atmane | 2 | 6 | 7 | | T Atmane | 7 | 4 | 6 | | | | | | | | | |
| LL | A Galarneau | 6 | 6 | | LL | A Galarneau | 5 | 6 | 4 | | | | | | | | | |
| 2 | A Bellier | 2 | 4 | | | | | | | | | | | | | | | |