# 2023 Oeiras CETO Open – Singles

Diana Shnaider was the defending champion but chose not to participate.
Nigina Abduraimova won the title, defeating Francisca Jorge in the final, 1–6, 6–4, 6–3.

## Seeds

* Olivia Gadecki (first round)
* Sinja Kraus (second round, retired)
* Elsa Jacquemot (quarterfinals)
* Greet Minnen (semifinals)
* Nigina Abduraimova (champion)
* Fernanda Contreras (semifinals)
* Magali Kempen (second round)
* Mona Barthel (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 | Final |
| 5 | Nigina Abduraimova | 7$^7$ | 6 | | | | | |
| 4 | Greet Minnen | 6$^5$ | 3 | | | | | |
| 4 | Greet Minnen | 6$^5$ | 3 | 5 | Nigina Abduraimova | 1 | 6 | 6 |
| | | | | | Francisca Jorge | 6 | 4 | 3 |
| 6 | Fernanda Contreras | 4 | 2 | | Francisca Jorge | 6 | 4 | 3 |
| | Francisca Jorge | 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 |
| 1 | O Gadecki | 7$^{12}$ | 5 | 4 | | | | | | | | | | | | |
| | Y Hatouka | 6$^{10}$ | 7 | 6 | | Y Hatouka | 6 | 6 | | | | | | | | |
| Q | A Nagy | 6 | 6 | | Q | A Nagy | 1 | 2 | | | | | | | | |
| WC | S Lança | 2 | 1 | | | | | | | Y Hatouka | 4 | 4 | | | | |
| | A Kulikova | 2 | 6 | 3 | | | | | 5 | N Abduraimova | 6 | 6 | | | | |
| | M Bayerlová | 6 | 4 | 6 | | M Bayerlová | 2 | 2 | | | | | | | | |
| | J Garland | 1 | 2 | | 5 | N Abduraimova | 6 | 6 | | | | | | | | |
| 5 | N Abduraimova | 6 | 6 | | | | | | | | | | 5 | N Abduraimova | 7$^7$ | 6 |
| 4 | G Minnen | 6 | 6 | | | | | | | | | | 4 | G Minnen | 6$^5$ | 3 |
| | K Thandi | 2 | 3 | | 4 | G Minnen | 7$^7$ | 6 | | | | | | | | |
| Q | L Cortez Llorca | 3 | 0 | | | N Berberović | 6$^4$ | 3 | | | | | | | | |
| | N Berberović | 6 | 6 | | | | | | 4 | G Minnen | 6 | 6 | | | | |
| Q | C Sauvant | 2 | 5 | | | | | | | J Mikulskytė | 0 | 1 | | | | |
| | J Mikulskytė | 6 | 7 | | | J Mikulskytė | 6 | 6 | | | | | | | | |
| | S Nahimana | 4 | 6 | 7 | | S Nahimana | 4 | 4 | | | | | | | | |
| 8 | M Barthel | 6 | 2 | 5 | | | | | | | | | | | | |

### 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 |
| 6 | F Contreras | 6 | 6 | | | | | | | | | | | | | | |
| WC | I Murta | 3 | 3 | | 6 | F Contreras | 2 | 6 | 6 | | | | | | | | |
| Q | U Eikeri | 6 | 1 | 6 | Q | U Eikeri | 6 | 3 | 4 | | | | | | | | |
| WC | I Gamarra Martins | 2 | 6 | 3 | | | | | | 6 | F Contreras | 6 | 6 | | | | |
| LL | E Yashina | 0 | 1 | | | | | | | 3 | E Jacquemot | 3 | 4 | | | | |
| Q | J Malečková | 6 | 6 | | Q | J Malečková | 6 | 4 | 2 | | | | | | | | |
| Q | E Hozumi | 4 | 4 | | 3 | E Jacquemot | 3 | 6 | 6 | | | | | | | | |
| 3 | E Jacquemot | 6 | 6 | | | | | | | | | | | 6 | F Contreras | 4 | 2 |
| 7 | M Kempen | 6 | 6 | | | | | | | | | | | | F Jorge | 6 | 6 |
| LL | Y Mansouri | 1 | 4 | | 7 | M Kempen | 6$^8$ | 3 | | | | | | | | | |
| Q | O Gavrilă | 7$^7$ | 5 | 1 | | F Jorge | 7$^{10}$ | 6 | | | | | | | | | |
| | F Jorge | 6$^3$ | 7 | 6 | | | | | | | F Jorge | 6 | 7$^7$ | | | | |
| WC | A Voloshchuk | 3 | 1 | | | | | | | | A Muhammad | 2 | 6$^3$ | | | | |
| | A Muhammad | 6 | 6 | | | A Muhammad | 6 | 3 | | | | | | | | | |
| Q | Jo Steur | 6 | 3 | 3 | 2 | S Kraus | 3 | 0$^r$ | | | | | | | | | |
| 2 | S Kraus | 4 | 6 | 6 | | | | | | | | | | | | | |