| ITF - Amstelveen W60 | 07/04 14:15 | 54 | [307] Diana Marcinkevica v Alana Parnaby [277] | 2-6,1-6 | |
| ITF - Gurugram W25 | 06/30 13:00 | 26 | Diana Marcinkevica v Saki Imamura | 2-6,2-6 | |
| ITF - Gurugram W25 | 06/29 09:30 | 25 | Diana Marcinkevica v Humera Baharmus | 1-6,6-4,6-2 | |
| ITF - Gurugram W25 | 06/24 04:30 | 27 | Diana Marcinkevica v Sofia Costoulas | 4-6,4-6 | |
| ITF - Gurugram W25 | 06/23 04:00 | 26 | Diana Marcinkevica v Mansi Vadyala | 6-2,6-0 | |
| ITF - Gurugram W25 | 06/22 07:00 | 25 | Diana Marcinkevica v Akanksha D Nitture | 6-0,6-4 | |
| ITF - Ilkley W100 | 06/15 11:45 | 25 | [136] Mai Hontama v Diana Marcinkevica [308] | 6-3,6-4 | |
| ITF - Ilkley W100 | 06/13 09:50 | 54 | [354] Alexandra Osborne v Diana Marcinkevica [308] | 7-6,1-6,8-10 | |
| ITF - Ilkley W100 | 06/12 10:00 | 54 | Ruby Cooling v Diana Marcinkevica | 6-3,1-6,4-10 | |
| ITF - Poertschach W60 | 06/07 09:20 | 25 | [311] Diana Marcinkevica v Stefanie Voegele [211] | 3-6,4-6 | |
| ITF - Brescia W60 | 06/01 15:35 | 25 | [294] Diana Marcinkevica v Jazmin Ortenzi [463] | 4-6,6-7 | |
| ITF - Warmbad-Villach W25 | 05/17 10:50 | 25 | [293] Diana Marcinkevica v Misaki Matsuda [420] | 3-6,3-6 | |
| ITF - Nottingham W25 | 05/12 10:25 | 26 | [295] Diana Marcinkevica v Sonay Kartal [375] | 3-6,6-2,4-6 | |
| ITF - Nottingham W25 | 05/10 11:30 | 25 | [295] Diana Marcinkevica v Rutuja Bhosale [497] | 7-6,6-3 | |
| ITF - Nottingham W25 | 05/04 09:00 | 25 | [289] Diana Marcinkevica v Freya Christie [365] | 7-5,1-6,4-6 | |
| ITF - Nottingham W25 | 04/20 10:25 | 25 | [394] Ioana Loredana Rosca v Diana Marcinkevica [284] | 6-2,6-2 | |
| ITF - Oeiras W80 | 04/03 09:00 | 54 | [362] Alice Rame v Diana Marcinkevica [287] | 6-3,6-1 | |
| ITF - Croissy-Beaubourg W60 | 03/30 08:00 | 26 | [287] Diana Marcinkevica v Leolia Jeanjean [321] | 4-6,6-4,4-6 | |
| ITF - Croissy-Beaubourg W60 | 03/29 08:00 | 25 | [213] Giulia G-Monticone v Diana Marcinkevica [287] | 6-7,4-6 | |
| ITF - Le Harve W25 | 03/20 14:40 | 54 | Diana Marcinkevica v Diana Martynov | 3-6,6-7 | |
| ITF - Nur-Sultan W25 | 03/02 04:00 | 25 | [180] Yuliya Hatouka v Diana Marcinkevica [279] | 7-5,6-1 | |
| ITF - Nur-Sultan W60 | 02/23 06:45 | 25 | Diana Marcinkevica v Eva Lys | 6-7,1-6 | |
| WTA Dubaj | 02/12 14:10 | 14 | [286] Diana Marcinkevica v Kirsten Flipkens [327] | 0-6,3-6 | |
| ITF - Sharm El Sheikh W25 | 02/12 08:00 | 25 | Diana Marcinkevica v Marina Melnikova | Cancelled | |
| ITF - Sharm El Sheikh W25 | 02/09 15:10 | 25 | [286] Diana Marcinkevica v Hong Yi Cody Wong [391] | 1-6,2-6 | |
| ITF - Sharm El Sheikh W25 | 02/02 12:05 | 25 | [283] Diana Marcinkevica v Ysaline Bonaventure [229] | 0-6,1-6 | |
| ITF - Navi Mumbai W25 | 01/02 04:30 | 29 | [358] Diana Marcinkevica v Ekaterina Reyngold [466] | 3-6,2-6 | |
| ITF - Navi Mumbai W25 | 01/01 04:30 | 28 | Diana Marcinkevica v Naho Sato | 6-2,7-5 | |
| ITF - Navi Mumbai W25 | 12/31 04:30 | 27 | Zeel Desai v Diana Marcinkevica | 6-7,4-6 | |
| ITF - Navi Mumbai W25 | 12/30 04:00 | 26 | Sowjanya Bavisetti v Diana Marcinkevica | 7-6,4-6,1-6 |