# 2023 Caldas da Rainha Ladies Open – Singles

Lucrezia Stefanini was the defending champion but chose not to participate.
Petra Marčinko won the title, defeating Léolia Jeanjean in the final, 6–4, 6–1.

## Seeds

* Laura Pigossi (semifinals)
* Nuria Párrizas Díaz (second round, retired)
* Léolia Jeanjean (final)
* Daria Snigur (second round)
* Céline Naef (first round)
* Yuriko Miyazaki (first round)
* Petra Marčinko (champion)
* Fiona Ferro (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 | Final | Final | Final | Final |
| 1 | Laura Pigossi | 4 | 4 | | | | |
| 3 | Léolia Jeanjean | 6 | 6 | | | | |
| 3 | Léolia Jeanjean | 6 | 6 | 3 | Léolia Jeanjean | 4 | 1 |
| | | | | 7 | Petra Marčinko | 6 | 6 |
| | Alina Korneeva | 6$^6$ | 6$^5$ | 7 | Petra Marčinko | 6 | 6 |
| 7 | Petra Marčinko | 7$^8$ | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | L Pigossi | 6 | 6 | | | | | | | | | | | | | | | |
| WC | F Tian | 3 | 0 | | 1 | L Pigossi | 6 | 7 | | | | | | | | | | |
| Q | D Hewitt | 6 | 6 | | Q | D Hewitt | 2 | 5 | | | | | | | | | | |
| WC | C Mesquita | 1 | 1 | | | | | | | 1 | L Pigossi | 6 | 1 | | | | | |
| | T Babos | 6 | 6 | | | | | | | | T Babos | 2 | 0$^r$ | | | | | |
| WC | S Lança | 1 | 1 | | | T Babos | 2 | 7$^7$ | 7$^7$ | | | | | | | | | |
| | N Abduraimova | 1 | 6 | 6 | | N Abduraimova | 6 | 6$^1$ | 6$^3$ | | | | | | | | | |
| 5 | C Naef | 6 | 3 | 3 | | | | | | | | | | | 1 | L Pigossi | 4 | 4 |
| 3 | L Jeanjean | 6$^1$ | 6 | 7$^7$ | | | | | | | | | | | 3 | L Jeanjean | 6 | 6 |
| | M Barthel | 7$^7$ | 2 | 6$^5$ | 3 | L Jeanjean | 6 | 6 | | | | | | | | | | |
| | A Zakharova | 3 | 2 | | | M Rouvroy | 2 | 4 | | | | | | | | | | |
| | M Rouvroy | 6 | 6 | | | | | | | 3 | L Jeanjean | 5 | 6 | 6 | | | | |
| Q | S Daavettila | 4 | 3 | | | | | | | | S Kartal | 7 | 3 | 2 | | | | |
| Q | E Silva | 6 | 6 | | Q | E Silva | 4 | 2 | | | | | | | | | | |
| | S Kartal | 6 | 2 | 6 | | S Kartal | 6 | 6 | | | | | | | | | | |
| 6 | Y Miyazaki | 3 | 6 | 4 | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | F Ferro | 6 | 6 | | | | | | | | | | | | | | |
| LL | R Bhatia | 1 | 2 | | 8 | F Ferro | 6$^4$ | 7 | 2 | | | | | | | | |
| Q | A Hesse | 7 | 6 | | Q | A Hesse | 7$^7$ | 5 | 6 | | | | | | | | |
| | F Jorge | 5 | 4 | | | | | | | Q | A Hesse | 3 | 2 | | | | |
| | A Korneeva | 6 | 6 | | | | | | | | A Korneeva | 6 | 6 | | | | |
| | L Bošković | 3 | 4 | | | A Korneeva | 6 | 6 | | | | | | | | | |
| Q | E Malõgina | 2 | 0 | | 4 | D Snigur | 1 | 3 | | | | | | | | | |
| 4 | D Snigur | 6 | 6 | | | | | | | | | | | | A Korneeva | 6$^6$ | 6$^5$ |
| 7 | P Marčinko | 6 | 6 | | | | | | | | | | | 7 | P Marčinko | 7$^8$ | 7$^7$ |
| Q | A Lahey | 4 | 4 | | 7 | P Marčinko | 6 | 6 | | | | | | | | | |
| Q | O Helmi | 7 | 4 | 1 | | M Bondarenko | 3 | 2 | | | | | | | | | |
| | M Bondarenko | 5 | 6 | 6 | | | | | | 7 | P Marčinko | 6 | 6 | | | | |
| | A Robbe | 2 | 7 | 6 | | | | | | | A Robbe | 3 | 1 | | | | |
| WC | A Voloshchuk | 6 | 5 | 1 | | A Robbe | 6 | 4 | | | | | | | | | |
| Q | S Bandecchi | 4 | 7 | 3 | 2 | N Párrizas Díaz | 4 | 1$^r$ | | | | | | | | | |
| 2 | N Párrizas Díaz | 6 | 5 | 6 | | | | | | | | | | | | | |