# 2023 Open Castilla y León – Singles

Hugo Grenier was the defending champion but retired from his first round match against Dominik Palán.
Pablo Llamas Ruiz won the title after defeating Antoine Escoffier 7–6$^{(11–9)}$, 7–6$^{(7–5)}$ in the final.

## Seeds

* Márton Fucsovics (quarterfinals)
* Hugo Grenier (first round, retired)
* Nicolas Moreno de Alboran (semifinals)
* Emilio Nava (first round)
* Mattia Bellucci (first round)
* Pablo Llamas Ruiz (champion)
* Antoine Escoffier (final)
* Ričardas Berankis (second 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 | Semifinals | Final | Final | Final | Final |
| | Térence Atmane | 4 | 7$^7$ | 3 | | | | |
| 7 | Antoine Escoffier | 6 | 6$^5$ | 6 | | | | |
| 7 | Antoine Escoffier | 6 | 6$^5$ | 6 | 7 | Antoine Escoffier | 6$^9$ | 6$^5$ |
| | | | | | 6 | Pablo Llamas Ruiz | 7$^{11}$ | 7$^7$ |
| 3 | Nicolas Moreno de Alboran | 7$^7$ | 1 | 6$^3$ | 6 | Pablo Llamas Ruiz | 7$^{11}$ | 7$^7$ |
| 6 | Pablo Llamas Ruiz | 6$^5$ | 6 | 7$^7$ | | | | |

### 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 | Semifinals |
| 1 | M Fucsovics | 6 | 6 | | | | | | | | | | | | | | | |
| | M Geerts | 3 | 2 | | 1 | M Fucsovics | 6 | 2 | 6 | | | | | | | | | |
| Q | Adrià Soriano Barrera | 6 | 2 | 1 | | N Mejía | 3 | 6 | 1 | | | | | | | | | |
| | N Mejía | 3 | 6 | 6 | | | | | | 1 | M Fucsovics | 3 | 6$^{10}$ | | | | | |
| | S Diez | 3 | 3 | | | | | | | | T Atmane | 6 | 7$^{12}$ | | | | | |
| | T Atmane | 6 | 6 | | | T Atmane | 6 | 6 | | | | | | | | | | |
| | R Peniston | 6 | 6 | | | R Peniston | 4 | 1 | | | | | | | | | | |
| 5 | M Bellucci | 4 | 4 | | | | | | | | | | | | T Atmane | 4 | 7$^7$ | 3 |
| 4 | Em Nava | 6$^4$ | 5 | | | | | | | | | | | 7 | A Escoffier | 6 | 6$^5$ | 6 |
| WC | D Jordà Sanchis | 7$^7$ | 7 | | WC | D Jordà Sanchis | 6 | 6$^6$ | 6 | | | | | | | | | |
| Q | E Butvilas | 6 | 7$^7$ | | Q | E Butvilas | 1 | 7$^8$ | 4 | | | | | | | | | |
| | Elmar Ejupovic | 3 | 6$^1$ | | | | | | | WC | D Jordà Sanchis | 3 | 1 | | | | | |
| Q | Luca Potenza | 6 | 7 | | | | | | | 7 | A Escoffier | 6 | 6 | | | | | |
| Q | John Echeverría | 4 | 5 | | Q | L Potenza | 1 | 3 | | | | | | | | | | |
| Q | I Montes de la Torre | 5 | 2 | | 7 | A Escoffier | 6 | 6 | | | | | | | | | | |
| 7 | A Escoffier | 7 | 6 | | | | | | | | | | | | | | | |

### Bottom 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 |
| 8 | R Berankis | 3 | 6 | 7$^7$ | | | | | | | | | | | | | |
| WC | G Loffhagen | 6 | 4 | 6$^5$ | 8 | R Berankis | 1 | 4 | | | | | | | | | |
| | D Added | 7$^7$ | 1 | 4 | WC | F Verdasco | 6 | 6 | | | | | | | | | |
| WC | F Verdasco | 6$^4$ | 6 | 6 | | | | | WC | F Verdasco | 3 | 2 | | | | | |
| | C İlkel | 7$^8$ | 7$^7$ | | | | | | 3 | N Moreno de Alboran | 6 | 6 | | | | | |
| Alt | G Oliveira | 6$^6$ | 6$^5$ | | | C İlkel | 4 | 2 | | | | | | | | | |
| | A Moro Cañas | 4 | 2 | | 3 | N Moreno de Alboran | 6 | 6 | | | | | | | | | |
| 3 | N Moreno de Alboran | 6 | 6 | | | | | | | | | | 3 | N Moreno de Alboran | 7$^7$ | 1 | 6$^3$ |
| 6 | P Llamas Ruiz | 7$^7$ | 6 | | | | | | | | | | 6 | P Llamas Ruiz | 6$^5$ | 6 | 7$^7$ |
| Q | Miguel Damas | 6$^4$ | 3 | | 6 | P Llamas Ruiz | 6 | 6 | | | | | | | | | |
| PR | P-H Herbert | 4 | 6$^4$ | | | M Lajal | 4 | 3 | | | | | | | | | |
| | M Lajal | 6 | 7$^7$ | | | | | | 6 | P Llamas Ruiz | 7$^7$ | 7 | | | | | |
| Alt | A Bellier | 6$^2$ | 4 | | | | | | | JP Ficovich | 6$^2$ | 5 | | | | | |
| | JP Ficovich | 7$^7$ | 6 | | | JP Ficovich | 7$^7$ | 6 | | | | | | | | | |
| Alt | Dominik Palán | 6 | 4 | | Alt | D Palán | 6$^5$ | 2 | | | | | | | | | |
| 2 | H Grenier | 4 | 1$^r$ | | | | | | | | | | | | | | |