| Singles | |
|---|---|
| 2023 Oeiras CETO Open | |
| Champion |  Nigina Abduraimova |
| Runner-up |  Francisca Jorge |
| Score | 1–6, 6–4, 6–3 |
Diana Shnaider was the defending champion [1] but chose not to participate.
Nigina Abduraimova won the title, defeating Francisca Jorge in the final, 1–6, 6–4, 6–3.
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)| Semifinals | Final | ||||||||||||
| 5 | Nigina Abduraimova | 77 | 6 | ||||||||||
| 4 | Greet Minnen | 65 | 3 | ||||||||||
| 5 | Nigina Abduraimova | 1 | 6 | 6 | |||||||||
| Francisca Jorge | 6 | 4 | 3 | ||||||||||
| 6 | Fernanda Contreras | 4 | 2 | ||||||||||
| Francisca Jorge | 6 | 6 | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | O Gadecki | 712 | 5 | 4 | |||||||||||||||||||||||
 Y Hatouka | 610 | 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 | 77 | 6 | ||||||||||||||||||||
| 4 | G Minnen | 6 | 6 | 4 | G Minnen | 65 | 3 | ||||||||||||||||||||
 K Thandi | 2 | 3 | 4 | G Minnen | 77 | 6 | |||||||||||||||||||||
| Q |  L Cortez Llorca | 3 | 0 |  N Berberović | 64 | 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 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | 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 | 68 | 3 | ||||||||||||||||||||
| Q |  O Gavrilă | 77 | 5 | 1 | F Jorge | 710 | 6 | ||||||||||||||||||||
| F Jorge | 63 | 7 | 6 | F Jorge | 6 | 77 | |||||||||||||||||||||
| WC | A Voloshchuk | 3 | 1 |  A Muhammad | 2 | 63 | |||||||||||||||||||||
| A Muhammad | 6 | 6 | A Muhammad | 6 | 3 | ||||||||||||||||||||||
| Q | Jo Steur | 6 | 3 | 3 | 2 | S Kraus | 3 | 0r | |||||||||||||||||||
| 2 | S Kraus | 4 | 6 | 6 | |||||||||||||||||||||||
Bojana Jovanovski was the defending champion, but lost in the second round to Ons Jabeur.
Elina Svitolina won the title, defeating Shahar Pe'er in the final 6–4, 6–4.
Donna Vekić was the defending champion, having won the event in 2012, but she chose not to participate.
Nigina Abduraimova was the defending champion, having won the event in 2013. She successfully defended her title by defeating Nao Hibino in the final, 6–3, 6–4
Yvonne Meusburger was the defending champion, but lost to Chanelle Scheepers in the second round.
Elina Svitolina was the defending champion, and successfully defended her title, defeating Bojana Jovanovski in the final 6–1, 7–6(7–2).
Donna Vekić was the defending champion, but chose not to participate this year.
Alizé Cornet was the defending champion, but lost to Anna Karolína Schmiedlová in the quarterfinals.
Elina Svitolina was the two-time defending champion, but chose not to participate this year.
Nao Hibino was the defending champion, but chose to participate in Nürnberg instead.
Chang Kai-chen was the defending champion, but lost to Nigina Abduraimova in the quarterfinals.
Kristýna Plíšková won the title, defeating defending champion Nao Hibino in the final, 6–3, 2–6, 6–3.
Ksenia Lykina was the defending champion, but lost to Zarina Diyas in the quarterfinals.
Yanina Wickmayer was the defending champion, but chose not to participate this year.
Zhang Shuai was the defending champion, but chose not to participate.
Ons Jabeur won the singles tennis title at the 2022 German Open after Belinda Bencic retired with an ankle injury from the final with the score at 6–3, 2–1.
This was the first edition of the tournament.
Sonay Kartal was the defending champion but chose not to participate.
Andreea Mitu was the defending champion but chose not to participate.
Jule Niemeier was the defending champion but chose not to participate.
Nigina Abduraimova was the defending champion but chose to compete in Lopota instead.