Stadium: Pista 6 Round: 25 Ground: Hardcourt outdoor
| ITF W25 Otocec | 2021/06/01 08:00 | Raluca Georgiana Serban v Nastja Kolar | 6-4,7-5 |
| ITF W25 Otocec | 2021/05/31 08:00 | Maja Makoric v Nastja Kolar | 4-6,2-6 |
| ITF W25 Otocec | 2021/05/25 08:00 | Cristiana Ferrando v Nastja Kolar | 6-4,4-6,10-1 |
| ITF W15 Tbilisi | 2021/05/20 05:55 | Zoe Howard v Nastja Kolar | 4-6,6-3,7-5 |
| ITF W15 Tbilisi | 2021/05/19 06:00 | Laetitia Pulchartova v Nastja Kolar | 2-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/15 06:00 | Nastja Kolar v Darja Semenistaja | 4-6,4-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/13 06:00 | Nastja Kolar v Rositsa Dencheva | 6-2,5-3 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/12 08:30 | Nastja Kolar v Silvia Maria Costache | 6-2,6-0 |
| WTA Strasbourg | 2021/05/22 09:00 | Evita Ramirez v Jessica Pieri | 3-6,6-4,7-6 |
| WTA Parma | 2021/05/15 15:00 | Caty McNally v Jessica Pieri | 6-2,7-6 |
| ITF W60 La Bisbal | 2021/05/14 10:15 | Olga Danilovic v Jessica Pieri | 6-4,6-4 |
| ITF W60 La Bisbal | 2021/05/13 08:00 | Kateryna Baindl v Jessica Pieri | 0-6,6-3,4-6 |
| ITF W60 La Bisbal | 2021/05/11 08:00 | Jessica Pieri v Timea Babos | 1-6,6-4,7-5 |
| ITF W60 La Bisbal | 2021/05/10 08:00 | Valentyna Ivakhnenko v Jessica Pieri | 0-6,2-6 |
| ITF W60 La Bisbal | 2021/05/09 07:55 | Leyre Romero Gormaz v Jessica Pieri | 4-6,4-6 |
| ITF W60 Zagreb | 2021/05/01 09:00 | Anhelina Kalinina v Jessica Pieri | 6-2,6-0 |