Stadium: Pista 6 Round: 25 Ground: Hardcourt outdoor
| ITF W25 Otocec | 2021/06/01 08:00 | Raluca Georgiana Serban v Kolar, Nastja | 6-4,7-5 |
| ITF W25 Otocec | 2021/05/31 08:00 | Makoric, Maja v Kolar, Nastja | 4-6,2-6 |
| ITF W25 Otocec | 2021/05/25 08:00 | Ferrando, Cristiana v Kolar, Nastja | 6-4,4-6,10-1 |
| ITF W15 Tbilisi | 2021/05/20 05:55 | Howard, Zoe v Kolar, Nastja | 4-6,6-3,7-5 |
| ITF W15 Tbilisi | 2021/05/19 06:00 | Pulchartova, Laetitia v Kolar, Nastja | 2-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/15 06:00 | Kolar, Nastja v Darja Semenistaja | 4-6,4-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/13 06:00 | Kolar, Nastja v Rositsa Dencheva | 6-2,5-3 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/12 08:30 | Kolar, Nastja v Silvia Maria Costache | 6-2,6-0 |
| WTA - Strasbourg | 2021/05/22 09:00 | Ramirez, Evita 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 | Ivakhnenko, Valentyna 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 |