| ITF W25 Tarvisio | 07/01 10:25 | 27 | [285] Dalila Jakupovic v Petra Marcinko [340] | 6-2,6-1 | |
| ITF W25 Tarvisio | 06/30 10:50 | 26 | [314] Veronika Erjavec v Petra Marcinko [340] | 5-7,1-6 | |
| ITF W25 Tarvisio | 06/29 10:55 | 25 | [366] Ilona G Ghioroaie v Petra Marcinko [340] | 1-6,5-7 | |
| ITF W25 Prokuplje | 06/25 08:00 | 28 | [316] Tara Wurth v Petra Marcinko [342] | 6-3,7-5 | |
| ITF W25 Prokuplje | 06/24 09:35 | 27 | [342] Petra Marcinko v Ilona G Ghioroaie [359] | 6-2,7-6 | |
| ITF W25 Prokuplje | 06/23 13:05 | 26 | Petra Marcinko v Daria Lodikova | 6-0,6-3 | |
| ITF W25 Prokuplje | 06/22 15:30 | 25 | Petra Marcinko v Dejana Radanovic | Retired | |
| ITF W60 Caserta | 06/08 11:35 | 25 | [340] Petra Marcinko v Camilla Rosatello [330] | 5-7,6-2,6-7 | |
| WTA Rabat | 05/17 13:55 | 26 | [361] Petra Marcinko v Astra Sharma [144] | 7-5,3-6,3-6 | |
| WTA Rabat | 05/15 13:00 | 25 | [77] Rebecca Peterson v Petra Marcinko [362] | 0-6,6-2,5-7 | |
| ITF W25 Split | 05/05 09:20 | 26 | [388] Petra Marcinko v Yuki Naito [219] | Retired | |
| ITF W25 Split | 05/04 13:50 | 25 | Petra Marcinko v Tina Cvetkovic | 6-1,6-2 |