| Singles | |
|---|---|
| 2021 Zavarovalnica Sava Portorož | |
| Champion |  Jasmine Paolini |
| Runner-up |  Alison Riske |
| Final score | 7–6(7–4), 6–2 |
| Draw | 32 |
| Seeds | 8 |
Anna Chakvetadze was the champion when the event was last held in 2010, but she retired from professional tennis in 2013. [1]
Jasmine Paolini won her maiden WTA Tour title, defeating Alison Riske in the final, 7–6(7–4), 6–2.
Petra Martić (First round)
Yulia Putintseva (Semifinals) Alison Riske (Final)
Sorana Cîrstea (Quarterfinals)
Tamara Zidanšek (Quarterfinals)
Dayana Yastremska (First round, retired)
Rebecca Peterson (First round) Donna Vekić (First round)| Semifinals | Final | ||||||||||||
| Kaja Juvan | 0 | 4 | |||||||||||
| 3 | Alison Riske | 6 | 6 | ||||||||||
| 3 | Alison Riske | 64 | 2 | ||||||||||
| Jasmine Paolini | 77 | 6 | |||||||||||
| Jasmine Paolini | 1 | 6 | 6 | ||||||||||
| 2 | Yulia Putintseva | 6 | 3 | 4 | |||||||||
| First Round | Second Round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | P Martić | 3 | 4 | ||||||||||||||||||||||||
| K Juvan | 6 | 6 | K Juvan | 77 | 6 | ||||||||||||||||||||||
| Q |  A Krunić | 6 | 6 | Q | A Krunić | 61 | 4 | ||||||||||||||||||||
| WC | Ž Falkner | 3 | 1 | K Juvan | 77 | 6 | |||||||||||||||||||||
| S Errani | 63 | 2 | 5 | T Zidanšek | 64 | 3 | |||||||||||||||||||||
| A Kalinina | 77 | 6 | A Kalinina | ||||||||||||||||||||||||
| Q | C Ferrando | 1 | 1 | 5 | T Zidanšek | w/o | |||||||||||||||||||||
| 5 | T Zidanšek | 6 | 6 | K Juvan | 0 | 4 | |||||||||||||||||||||
| 3 | A Riske | 7 | 6 | 3 | A Riske | 6 | 6 | ||||||||||||||||||||
| WC | P Lovrič | 5 | 3 | 3 | A Riske | 3 | 6 | 6 | |||||||||||||||||||
| Q |  V Kužmová | 6 | 6 | Q | V Kužmová | 6 | 3 | 3 | |||||||||||||||||||
| Q | T Mrdeža | 2 | 3 | 3 | A Riske | 6 | 6 | ||||||||||||||||||||
| WC | N Radišić | 6 | 1 | 2 |  K Mladenovic | 4 | 1 | ||||||||||||||||||||
| K Mladenovic | 4 | 6 | 6 | K Mladenovic | 6 | 6 | |||||||||||||||||||||
| A Konjuh | 0 | 6 | 6 | A Konjuh | 0 | 4 | |||||||||||||||||||||
| 8 | D Vekić | 6 | 3 | 2 | |||||||||||||||||||||||
| First Round | Second Round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | D Yastremska | 65 | 1r | ||||||||||||||||||||||||
| J Paolini | 77 | 4 | J Paolini | 6 | 6 | ||||||||||||||||||||||
 D Kovinić | 0 | 4 |  A Kalinskaya | 3 | 2 | ||||||||||||||||||||||
| A Kalinskaya | 6 | 6 | J Paolini | 6 | 4 | 6 | |||||||||||||||||||||
 T Martincová | 6 | 6 | 4 | S Cîrstea | 4 | 6 | 1 | ||||||||||||||||||||
| K Kučová | 4 | 1 | T Martincová | 5 | 2 | ||||||||||||||||||||||
 H Watson | 1 | 3 | 4 | S Cîrstea | 7 | 6 | |||||||||||||||||||||
| 4 | S Cîrstea | 6 | 6 | J Paolini | 1 | 6 | 6 | ||||||||||||||||||||
| 7 | R Peterson | 3 | 3 | 2 | Y Putintseva | 6 | 3 | 4 | |||||||||||||||||||
| Q | L Bronzetti | 6 | 6 | Q | L Bronzetti | 2 | 6 | 6 | |||||||||||||||||||
| B Pera | 6 | 6 | B Pera | 6 | 3 | 3 | |||||||||||||||||||||
| F Ferro | 4 | 3 | Q | L Bronzetti | 3 | 2 | |||||||||||||||||||||
| K Zavatska | 5 | 3 | 2 | Y Putintseva | 6 | 6 | |||||||||||||||||||||
| Q | K Boulter | 7 | 6 | Q | K Boulter | 3 | 1 | ||||||||||||||||||||
| J Cristian | 4 | 4 | 2 | Y Putintseva | 6 | 6 | |||||||||||||||||||||
| 2 | Y Putintseva | 6 | 6 | ||||||||||||||||||||||||
Lesley Pattinama Kerkhove (First round) Viktória Kužmová (Qualified) Grace Min (First round, retired) Lucia Bronzetti (Qualified) Aleksandra Krunić (Qualified) Katie Boulter (Qualified) Lucrezia Stefanini (Qualifying competition)
Urszula Radwańska (First round, retired)
Susan Bandecchi (Qualifying competition) Tereza Mrdeža (Qualified)
Yuliya Hatouka (Qualifying competition) Irina Fetecău (Qualifying competition)| First Round | Qualifying Competition | ||||||||||||
| 1 | Lesley Pattinama Kerkhove | 6 | 3 | 3 | |||||||||
| Cristiana Ferrando | 0 | 6 | 6 | ||||||||||
| Cristiana Ferrando | 77 | 6 | |||||||||||
| 11 | Yuliya Hatouka | 62 | 1 | ||||||||||
| Camilla Rosatello | 6 | 3 | 2 | ||||||||||
| 11 | Yuliya Hatouka | 3 | 6 | 6 | |||||||||
| First Round | Qualifying Competition | ||||||||||||
| 2 | Viktória Kužmová | 6 | 6 | ||||||||||
| Stefania Rubini | 3 | 1 | |||||||||||
| 2 | Viktória Kužmová | 6 | 4 | 77 | |||||||||
| 7 | Lucrezia Stefanini | 4 | 6 | 65 | |||||||||
| WC | Noka Jurič | 1 | 3 | ||||||||||
| 7 | Lucrezia Stefanini | 6 | 6 | ||||||||||
| First Round | Qualifying Competition | ||||||||||||
| 3 | Grace Min | 5 | 0r | ||||||||||
| Emina Bektas | 7 | 0 | |||||||||||
| Emina Bektas | 6 | 4 | 0 | ||||||||||
| 10 | Tereza Mrdeža | 4 | 6 | 6 | |||||||||
 Lina Gjorcheska | 6 | 0 | 1 | ||||||||||
| 10 | Tereza Mrdeža | 3 | 6 | 6 | |||||||||
| First Round | Qualifying Competition | ||||||||||||
| 4 | Lucia Bronzetti | 3 | 6 | 6 | |||||||||
 Fanny Stollár | 6 | 3 | 2 | ||||||||||
| 4 | Lucia Bronzetti | 6 | 6 | ||||||||||
| PR | Samantha Murray Sharan | 2 | 3 | ||||||||||
| PR | Samantha Murray Sharan | 6 | 2 | ||||||||||
| 8 | Urszula Radwańska | 4 | 0r | ||||||||||
| First Round | Qualifying Competition | ||||||||||||
| 5 | Aleksandra Krunić | 6 | 6 | ||||||||||
| WC | Tina Cvetkovič | 1 | 1 | ||||||||||
| 5 | Aleksandra Krunić | 2 | 6 | 6 | |||||||||
| 9 | Susan Bandecchi | 6 | 1 | 3 | |||||||||
| Alt | Ekaterina Yashina | 5 | 5 | ||||||||||
| 9 | Susan Bandecchi | 7 | 7 | ||||||||||
| First Round | Qualifying Competition | ||||||||||||
| 6 | Katie Boulter | 6 | 6 | ||||||||||
| WC | Manca Pislak | 3 | 2 | ||||||||||
| 6 | Katie Boulter | 77 | 6 | ||||||||||
| 12 | Irina Fetecău | 64 | 2 | ||||||||||
| WC | Ela Nala Milić | 1 | 0 | ||||||||||
| 12 | Irina Fetecău | 6 | 6 | ||||||||||
Alexandra Panova was the defending champion, but chose not to participate.
Jelena Janković was the defending champion, but lost in the semifinals to Caroline Wozniacki.
Timea Bacsinszky was the defending champion, but lost in the second round to Catherine Bellis.
Lesia Tsurenko was the defending champion, but lost in the first round to Aleksandra Krunić.
Tímea Babos was the defending champion, but lost in the second round to Mona Barthel.
Anett Kontaveit was the defending champion, but lost in the first round to Veronika Kudermetova.
Anastasija Sevastova was the defending champion, but lost in the final to Tatjana Maria, 4–6, 5–7. This was Maria's first WTA title.
Zhang Shuai was the defending champion, but she withdrew before her first round match against Wang Yafan.
Petra Kvitová was the defending champion, but lost to Donna Vekić in the quarterfinals.
Alison Van Uytvanck was the defending champion and successfully defended her title, defeating Markéta Vondroušová in the final, 1–6, 7–5, 6–2.
The singles tournament at the 2019 WTA 250 Ladies Open Lugano in tennis was played on clay and contested between 50 women on 8 — 14 April 2019. Elise Mertens was defending champion, but abstained.
Aleksandra Krunić was the defending champion, but lost to Kirsten Flipkens in the first round, in a rematch of the previous year's final.
Anastasija Sevastova was the defending champion, but lost in the second round to Patricia Maria Țig.
Roberta Vinci was the champion the last time the tournament was held in 2013, but she has since retired from professional tennis.
Margarita Gasparyan was the defending champion. but lost in the second round to Danka Kovinić.
Madison Keys was the defending champion but lost in the second round to Ons Jabeur.
Ashleigh Barty was the defending champion from when the tournament was last held in 2019, and she successfully defended her title after Bianca Andreescu retired from the final with the scoreline at 6–3, 4–0. Barty won the title after saving a match point in the second round against Kristína Kučová. This was also the first time in Barty's career that she successfully defended a singles title.
The 2021 WTA Slovenia Open was a WTA 250 tournament played on outdoor hard courts. It was the 7th edition of the Slovenia Open, last held in 2010. It was primarily organised due to the cancellation of the Asian tournaments during the 2021 season because of the ongoing COVID-19 pandemic. The 2021 event took place at the Tennis Club Portorož in Portorož, Slovenia from 13 to 19 September 2021.
This was the first edition of the women's event.
Belinda Bencic was the defending champion, having won the previous edition in 2019, but she withdrew before the tournament began.
| Grand Slam events | |
|---|---|
| WTA 1000 tournaments | |
| WTA 500 tournaments | |
| WTA 250 tournaments |
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| Team events | |
Bold denotes the mandatory tournaments (WTA 1000)  – Tournaments are affected by the COVID-19 pandemic * – Tournaments are introduced due to the impact of the COVID-19 pandemic | |