| ITF W25 Roehampton | 08/09 09:25 | 25 | [289] Destanee Aiava v Diana Marcinkevica [420] | 7-6,6-2 | |
| ITF W60 Barcelona | 08/01 17:45 | 25 | [397] Diana Marcinkevica v Alexandra Eala [248] | Retired | |
| ITF W60 Barcelona | 07/31 09:45 | 54 | Diana Marcinkevica v Chelsea Fontenel | 3-6,6-3,6-2 | |
| ITF W60 Barcelona | 07/30 12:30 | 54 | Diana Marcinkevica v Judith H Miranda | 6-3,6-2 | |
| ITF W25 El Espinar | 07/25 07:50 | 25 | Diana Marcinkevica v Lucia Peyre | 2-6,5-7 | |
| ITF W100 Vitoria-Gasteiz | 07/19 11:50 | 25 | [362] Eva Guerrero Alvarez v Diana Marcinkevica [398] | 6-2,6-4 | |
| ITF W25 Don Benito | 07/14 09:40 | 27 | [386] Diana Marcinkevica v Joanna Garland [274] | 1-6,3-6 | |
| ITF W25 Don Benito | 07/13 10:55 | 26 | Diana Marcinkevica v Michika Ozeki | 6-0,4-6,7-6 | |
| ITF W25 Don Benito | 07/11 09:15 | 25 | Diana Marcinkevica v Isabella B Aguirre | 4-6,6-4,7-5 | |
| ITF W25 Cantanhede | 07/04 10:00 | 25 | [433] Valentina Ryser v Diana Marcinkevica [386] | 6-4,6-2 | |
| ITF W25 Zaragoza | 06/23 08:00 | 27 | [395] Diana Marcinkevica v Rosa Vicens Mas [221] | 0-6,1-6 | |
| ITF W25 Zaragoza | 06/21 12:45 | 26 | [395] Diana Marcinkevica v Robin Anderson [305] | 6-4,6-1 | |
| ITF W25 Zaragoza | 06/20 13:05 | 25 | [257] Gabriela Knutson v Diana Marcinkevica [395] | 6-0,3-6,3-6 | |
| ITF W25 Zaragoza | 06/19 16:35 | 54 | Diana Marcinkevica v Yaroslava Bartashevich | 6-4,6-4 | |
| ITF W25 Zaragoza | 06/18 16:00 | 54 | Diana Marcinkevica v Martina Genis Salas | 6-1,6-0 | |
| ITF W60 Biarritz | 06/13 10:45 | 54 | [390] Diana Marcinkevica v Nina Radovanovic [496] | 4-6,6-0,1-6 | |
| ITF W60 Biarritz | 06/12 08:00 | 54 | Diana Marcinkevica v Helena Mohamed | 4-6,6-2,6-2 | |
| ITF W25 Poertschach | 06/07 10:45 | 26 | [281] Weronika Falkowska v Diana Marcinkevica [398] | 6-3,6-3 | |
| ITF W25 Poertschach | 06/06 16:05 | 25 | Emma Slavikova v Diana Marcinkevica | 2-6,3-6 | |
| ITF W25 Annenheim | 06/01 07:55 | 27 | [398] Diana Marcinkevica v Alexandra Ignatik [264] | 6-7,1-6 | |
| ITF W25 Annenheim | 05/31 08:00 | 26 | [323] Michaela Bayerlova v Diana Marcinkevica [398] | 4-6,6-7 | |
| ITF W25 Annenheim | 05/30 09:40 | 25 | Emma Kette v Diana Marcinkevica | 0-6,2-6 | |
| ITF W25 Warmbad-Villach | 05/23 09:50 | 25 | [390] Diana Marcinkevica v Lena Papadakis [308] | 3-6,3-6 | |
| ITF W25 Feld Am See | 05/17 09:20 | 25 | [147] Reka-Luca Jani v Diana Marcinkevica [388] | 6-4,6-7,6-2 | |
| ITF W25 Nottingham | 04/28 10:10 | 27 | [293] Arina Rodionova v Diana Marcinkevica [395] | 6-3,6-0 | |
| ITF W25 Nottingham | 04/27 09:00 | 26 | Olivia Lincer v Diana Marcinkevica | 7-6,1-6,2-6 | |
| ITF W25 Nottingham | 04/25 10:50 | 25 | [457] Elena-Teodora Cadar v Diana Marcinkevica [395] | 4-6,2-6 | |
| ITF W25 Nottingham | 04/20 11:55 | 26 | Diana Marcinkevica v Hannah Klugman | 3-6,4-6 | |
| ITF W25 Nottingham | 04/19 09:00 | 25 | [393] Diana Marcinkevica v Julie Belgraver [439] | 7-5,7-6 | |
| Billie Jean King Cup | 04/14 09:10 | 2 | [395] Diana Marcinkevica v Ipek Oz [235] | 1-6,2-6 |