

Introduction
Nastja Kolar (born July 15, 1994) is a Slovenian tennis player. Her highest rankings are No. 178 in singles and No. 140 in doubles. She was a talented junior, her highest ranking was fourth.
Professional career
2009
In July, Kolar performed her first WTA tournament, Slovenia Open in Portorož. She lost against Roberta Vinci in the first round. In the previous year, she stuck in qualifications of the same tournament, which were also her first WTA Tour qualifications.
2010
Kolar won a $10,000 tournament in Croatia. It was her first ITF title and the first time she reached the top 700 in WTA rankings.
2011
In May, Kolar won her second ITF tournament in Slovenia; it was a $25,000 event.
In July, she qualified for the Gastein Ladies, a WTA event. She then won her first WTA Tour-level match when she defeated Alla Kudryavtseva in straight sets to advance to the second round; for the first time she reached top 300 in WTA rankings. In July, she won the Girls 18 European Junior Championships title at Klosters, Switzerland.
ITF finals
| Legend |
|---|
| $100,000 tournaments |
| $75,000 tournaments |
| $50,000 tournaments |
| $25,000 tournaments |
| $15,000 tournaments |
| $10,000 tournaments |
Singles: 21 (9–12)
| Outcome | No. | Date | Tournament | Surface | Opponent | Score |
|---|---|---|---|---|---|---|
| Winner | 1. | 21 August 2010 | Čakovec, Croatia | Clay | Paola Cigui | 7–5, 6–4 |
| Winner | 2. | 5 June 2011 | Maribor, Slovenia | Clay | Maša Zec Peškirič | 7–5, 6–4 |
| Runner-up | 1. | 25 August 2013 | Pörtschach, Austria | Clay | Gioia Barbieri | 2–6, 3–6 |
| Runner-up | 2. | 8 September 2013 | Mestre, Italy | Clay | Claire Feuerstein | 1–6, 6–7 |
| Runner-up | 3. | 24 November 2013 | Sharm El Sheikh, Egypt | Clay | Victoria Kan | 4–6, 4–6 |
| Winner | 3. | 26 January 2014 | Kaarst, Germany | Carpet (i) | Natela Dzalamidze | 4–6, 6–1, 6–4 |
| Winner | 4. | 21 June 2014 | Ystad, Sweden | Clay | Sandra Zaniewska | 6–4, 6–4 |
| Runner-up | 4. | 28 June 2015 | Lenzerheide, Switzerland | Clay | Tereza Martincová | 3–6, 4–6 |
| Runner up | 5. | 12 June 2016 | Antalya, Turkey | Hard | Zuzana Zlochová | 6–3, 2–6, 0–3 ret. |
| Runner-up | 6. | 9 April 2017 | Heraklion, Greece | Clay | Nina Alibalić | 1–6, 3–6 |
| Runner-up | 7. | 17 September 2017 | Prague, Czech Republic | Clay | Miriam Kolodziejová | 2–6, 7–5, 4–6 |
| Runner-up | 8. | 15 October 2017 | Sharm El Sheikh, Egypt | Hard | Tereza Mihalíková | 2–6, 4–6 |
| Runner-up | 9. | 3 December 2017 | Cairo, Egypt | Clay | Sandra Samir | 4–6, 1–6 |
| Winner | 5. | 18 February 2018 | Sharm El Sheik, Egypt | Hard | Bunyawi Thamchaiwat | 6–2, 6–4 |
| Winner | 6. | 24 March 2018 | Manama, Bahrain | Hard | Tereza Mihalíková | 6–4, 6–2 |
| Winner | 7. | 1 April 2018 | Sharm El Sheikh, Egypt | Hard | Angelina Gabueva | 2–6, 6–4, 6–0 |
| Winner | 8. | 21 October 2018 | Sharm El Sheikh, Egypt | Hard | Anastasia Sukhotina | 6–1, 6–1 |
| Runner-up | 10. | 21 April 2019 | Cairo, Egypt | Clay | Despina Papamichail | 3–6, 6–4, 4–6 |
| Runner-up | 11. | 22 September 2019 | Cairo, Egypt | Clay | Sandra Samir | 3–6, 4–6 |
| Winner | 9. | 29 September 2019 | Cairo, Egypt | Clay | Sandra Samir | 6–3, 5–7, 7–6 |
| Runner-up | 12. | 20 October 2019 | Lagos, Nigeria | Hard | Riya Bhatia | 5–7, 6–1, 3–6 |
Doubles: 28 (15–13)
| Outcome | No. | Date | Tournament | Surface | Partner | Opponents | Score |
|---|---|---|---|---|---|---|---|
| Winner | 1. | 24 August 2009 | Velenje, Slovenia | Clay | Polona Rebersak | Camelia Hristea Diana Marcu |
6–3, 6–2 |
| Winner | 2. | 16 August 2010 | Čakovec, Croatia | Clay | Polona Rebersak | Katarína Baranová Simonka Parajová |
6–0, 6–1 |
| Runner-up | 1. | 12 August 2013 | Innsbruck, Austria | Clay | Polona Rebersak | Lucy Brown Hilda Melander |
6–3, 3–6, [7–10] |
| Winner | 3. | 19 August 2013 | Pörtschach, Austria | Clay | Polona Rebersak | Gioia Barbieri Giulia Sussarello |
6–0, 2–6, [10–4] |
| Winner | 4. | 26 January 2014 | Kaarst, Germany | Carpet (i) | Olga Ianchuk | Vivian Heisen Linda Prenkovic |
7–5, 6–3 |
| Winner | 5. | 21 June 2014 | Ystad, Sweden | Clay | Yvonne Neuwirth | Anna Danilina Xenia Knoll |
7–6, 3–6, [10–6] |
| Winner | 6. | 29 September 2014 | Monterrey, Mexico | Hard | Chantal Škamlová | Florencia Molinero Sofia Shapatava |
6–3, 2–6, [10–5] |
| Runner-up | 2. | 3 November 2014 | Sharm El Sheikh, Egypt | Hard | Olga Ianchuk | Antonia Lottner Laura Siegemund |
1–6, 1–6 |
| Runner-up | 3. | 1 December 2014 | Antalya, Turkey | Hard | Ekaterine Gorgodze | Sofia Kvatsabaia Chantal Škamlová |
w/o |
| Winner | 7. | 19 December 2014 | Ankara, Turkey | Hard | Ekaterine Gorgodze | Oleksandra Korashvili Elitsa Kostova |
6–4, 7–6 |
| Winner | 8. | 1 May 2015 | Pula, Italy | Clay | Despina Papamichail | Diana Buzean Alice Matteucci |
6–1, 1–6, [10–8] |
| Winner | 9. | 29 May 2015 | Maribor, Slovenia | Clay | Ekaterine Gorgodze | Petra Krejsová Kateřina Vaňková |
6–2, 6–4 |
| Runner-up | 4. | 26 December 2015 | Antalya, Turkey | Hard | Karin Kennel | Aminat Kushkhova Julia Stamatova |
5–7, 1–6 |
| Winner | 10. | 10 January 2016 | Antalya, Turkey | Clay | Jasmina Tinjić | Julia Grabher Anna Slováková |
7–6, 3–6, [10–6] |
| Winner | 11. | 2 April 2016 | Sharm El Sheikh, Egypt | Hard | Mariam Bolkvadze | Oleksandra Korashvili Margarita Lazareva |
7–6, 7–5 |
| Runner-up | 5. | 21 May 2016 | Antalya, Turkey | Hard | Francesca Stephenson | Kyra Shroff Dhruthi Tatachar Venugopal |
3–6, 7–5, [1–10] |
| Runner-up | 6. | 4 June 2016 | Antalya, Turkey | Hard | Francesca Stephenson | Lou Brouleau Emma Lene |
5–7, 3–6 |
| Runner-up | 7. | 11 June 2016 | Antalya, Turkey | Hard | Francesca Stephenson | Masa Jovanovic Phillis Vanenburg |
w/o |
| Winner | 12. | 17 June 2016 | Maribor, Slovenia | Clay | Francesca Stephenson | Polona Reberšak Gabriela Talabă |
5–7, 6–0, [10–3] |
| Runner-up | 8. | 22 July 2016 | Bad Waltersdorf, Austria | Clay | Francesca Stephenson | Nina Potočnik Polona Reberšak |
3–6, 4–6 |
| Runner-up | 9. | 11 February 2017 | Antalya, Turkey | Clay | Karin Kennel | Başak Eraydın Valentyna Ivakhnenko |
6–7, 2–6 |
| Winner | 13. | 8 April 2017 | Heraklion, Greece | Clay | Jasmina Tinjić | Tamara Čurović Camila Giangreco Campiz |
6–1, 6–1 |
| Runner-up | 10. | 14 October 2017 | Sharm El Sheikh, Egypt | Hard | Barbara Bonić | Nina Kruijer Suzan Lamens |
6–3, 5–7, [8–10] |
| Runner-up | 11. | 21 October 2017 | Sharm El Sheikh, Egypt | Hard | Caroline Ilowska | Emilie Francati Kanika Vaidya |
6–3, 5–7, [7–10] |
| Runner-up | 12. | 28 October 2017 | Sharm El Sheikh, Egypt | Hard | Elena-Teodora Cadar | Ola Abou Zekry Linnéa Malmqvist |
7–5, 3–6, [3–10] |
| Winner | 14. | 2 December 2017 | Cairo, Egypt | Clay | Rio Kitagawa | Annick Melgers Arina Gabriela Vasilescu |
6–2, 4–6, [10–4] |
| Winner | 15. | 9 December 2017 | Cairo, Egypt | Clay | Rio Kitagawa | Melanie Klaffner Jelena Stojanovic |
1–6, 6–4, [10–2] |
| Runner-up | 13. | 14 April 2019 | Óbidos, Portugal | Carpet | Mariam Bolkvadze | Sofia Shapatava Emily Webley-Smith |
1–6, 6–2, [9–11] |