| ITF W75 Andrézieux-Bouthéon | 01/31 11:50 | 25 | [192] Petra Marcinko v Ipek Oz [236] | 6-7,6-7 | |
| Open de Australia - Femenino | 01/09 00:30 | 14 | [166] Simona Waltert v Petra Marcinko [174] | 6-1,6-1 | |
| WTA Florianópolis | 11/21 15:00 | 25 | [129] Leolia Jeanjean v Petra Marcinko [172] | Retired | |
| WTA Monastir | 10/19 12:20 | 26 | [30] Jasmine Paolini v Petra Marcinko [140] | 6-4,3-6,6-2 | |
| WTA Monastir | 10/17 12:25 | 25 | [110] Marina Bassols Ribera v Petra Marcinko [140] | 6-7,2-6 | |
| ITF W60 Caldas da Rainha | 09/24 09:20 | 29 | [151] Leolia Jeanjean v Petra Marcinko [176] | 4-6,1-6 | |
| ITF W60 Caldas da Rainha | 09/23 09:30 | 28 | [186] Alina Korneeva v Petra Marcinko [176] | 6-7,6-7 | |
| ITF W60 Caldas da Rainha | 09/22 10:00 | 27 | [176] Petra Marcinko v Alice Robbe [220] | 6-3,6-1 | |
| ITF W60 Caldas da Rainha | 09/21 12:30 | 26 | Petra Marcinko v Maria Bondarenko | 6-3,6-2 | |
| ITF W60 Caldas da Rainha | 09/19 09:30 | 25 | [176] Petra Marcinko v Ashley Lahey [317] | 6-4,6-4 | |
| US Open - Femenino | 08/24 14:00 | 15 | [159] Erika Andreeva v Petra Marcinko [178] | 6-4,6-2 | |
| US Open - Femenino | 08/22 15:00 | 14 | [149] Jil Teichmann v Petra Marcinko [178] | 3-6,1-6 | |
| WTA Kozerki | 08/07 12:55 | 25 | [112] Greet Minnen v Petra Marcinko [177] | 6-1,6-0 | |
| WTA Iasi | 07/19 15:00 | 26 | [131] Simona Waltert v Petra Marcinko [173] | 7-6,6-3 | |
| WTA Iasi | 07/18 10:00 | 25 | [173] Petra Marcinko v Ipek Oz [221] | 7-6,3-6,6-0 | |
| ITF W60 Liepaja | 07/07 08:00 | 27 | [412] Jessie Aney v Petra Marcinko [195] | 6-1,6-2 | |
| ITF W60 Liepaja | 07/06 10:20 | 26 | [241] Irene B Escorihuela v Petra Marcinko [195] | 3-6,4-6 | |
| ITF W60 Liepaja | 07/05 07:25 | 25 | [383] Lia Karatancheva v Petra Marcinko [195] | 5-7,1-6 | |
| ITF W25 Tarvisio | 07/01 08:15 | 29 | [195] Petra Marcinko v Katarzyna Kawa [276] | 6-1,4-6,6-2 | |
| ITF W25 Tarvisio | 06/30 14:00 | 28 | [195] Petra Marcinko v Tena Lukas [300] | 6-4,6-2 | |
| ITF W25 Tarvisio | 06/29 15:25 | 27 | Petra Marcinko v Arianna Zucchini | 6-4,6-1 | |
| ITF W25 Tarvisio | 06/29 09:35 | 26 | Petra Marcinko v Federica Di Sarra | 6-2,6-3 | |
| ITF W25 Tarvisio | 06/27 11:50 | 25 | [195] Petra Marcinko v Aneta Laboutkova [428] | 6-2,6-0 | |
| ITF W60 Roma | 06/18 09:15 | 29 | [488] Georgia Pedone v Petra Marcinko [250] | 2-6,2-6 | |
| ITF W60 Roma | 06/17 09:50 | 28 | [328] Sapfo Sakellaridi v Petra Marcinko [250] | 2-6,3-6 | |
| ITF W60 Roma | 06/16 12:40 | 27 | [285] Astra Sharma v Petra Marcinko [250] | 1-6,6-7 | |
| ITF W60 Roma | 06/16 07:25 | 26 | [250] Petra Marcinko v Dalila Spiteri [472] | 6-1,6-4 | |
| ITF W60 Roma | 06/15 09:00 | 25 | Petra Marcinko v Natalia Siedliska | 6-3,6-0 | |
| WTA Makarska | 06/07 09:30 | 25 | [262] Petra Marcinko v Diane Parry [79] | 2-6,4-6 | |
| Open de Francia - Femenino | 05/24 15:20 | 15 | [257] Petra Marcinko v Clara Tauson [126] | 2-6,1-6 |