2021 Zavarovalnica Sava Portorož

The 2021 WTA Slovenia Open (also known as the Zavarovalnica Sava Portorož for sponsorship purposes) 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.

Singles

 * 🇮🇹 Jasmine Paolini def. 🇺🇸 Alison Riske, 7–6(7–4), 6–2

This was Paolini's maiden WTA Tour singles title.

Doubles

 * 🇷🇺 Anna Kalinskaya / 🇸🇰 Tereza Mihalíková def. 🇷🇸 Aleksandra Krunić / Lesley Pattinama Kerkhove, 4–6, 6–2, [12–10]

Seeds

 * Rankings are as of August 30, 2021.

Other entrants
The following players received wildcard s into the singles main draw:
 * Živa Falkner
 * Pia Lovrič
 * Nika Radišić

The following players received entry from the qualifying draw:
 * 🇬🇧 Katie Boulter
 * 🇮🇹 Lucia Bronzetti
 * 🇮🇹 Cristiana Ferrando
 * 🇷🇸 Aleksandra Krunić
 * 🇸🇰 Viktória Kužmová
 * Tereza Mrdeža

Withdrawals

 * Before the tournament
 * 🇪🇸 Paula Badosa → replaced by 🇮🇹 Sara Errani
 * 🇷🇺 Anna Blinkova → replaced by 🇷🇴 Jaqueline Cristian
 * 🇫🇷 Caroline Garcia → replaced by 🇸🇰 Kristína Kučová
 * Polona Hercog → replaced by Kaja Juvan
 * 🇷🇺 Daria Kasatkina → replaced by Ana Konjuh
 * 🇷🇴 Elena-Gabriela Ruse → replaced by 🇷🇺 Anna Kalinskaya
 * 🇪🇸 Sara Sorribes Tormo → replaced by 🇮🇹 Jasmine Paolini

Seeds

 * 1 Rankings are as of 30 August 2021.

Other entrants
The following pairs received wildcards into the doubles main draw:
 * Tina Cvetkovič / Ela Nala Milić
 * Živa Falkner / Pia Lovrič

Withdrawals

 * Before the tournament
 * 🇷🇴 Mihaela Buzărnescu / 🇵🇱 Katarzyna Piter → replaced by 🇵🇱 Katarzyna Piter / 🇬🇧 Heather Watson
 * 🇬🇧 Harriet Dart / 🇨🇿 Renata Voráčová → replaced by 🇲🇪 Danka Kovinić / 🇨🇿 Renata Voráčová
 * 🇵🇱 Katarzyna Kawa / 🇸🇰 Tereza Mihalíková → replaced by 🇷🇺 Anna Kalinskaya / 🇸🇰 Tereza Mihalíková
 * 🇷🇴 Monica Niculescu / 🇷🇴 Elena-Gabriela Ruse → replaced by 🇮🇳 Rutuja Bhosale / 🇬🇧 Emily Webley-Smith