Stadium: COURT 1 Round: 25 Ground: Clay
| ITF Women LPD Gran Canaria | 2018/08/09 10:00 | Irene Burillo Escorihuela v Sizikova, Yana | 6-1,3-6,7-6 |
| ITF Women LPD Gran Canaria | 2018/08/08 11:30 | Sizikova, Yana v Andrea Gamiz | 2-6,6-4,7-5 |
| ITF Women LPD Gran Canaria | 2018/08/06 09:00 | Molina Megias, Carlota v Sizikova, Yana | 4-6,5-7 |
| WTA Moscow Qual | 2018/07/23 10:30 | Sizikova, Yana v Martina Trevisan | 6-3,2-6,2-6 |
| WTA Moscow Qual | 2018/07/23 07:00 | Fujiwara, Rika v Sizikova, Yana | 1-6,4-6 |
| WTA Gstaad Qual | 2018/07/14 09:10 | Conny Perrin v Sizikova, Yana | 6-4,6-4 |
| ITF Women Getxo | 2018/07/10 08:00 | Sizikova, Yana v Saez Larra, Olga | 4-6,1-6 |
| ITF Women Ilkley Qual | 2018/06/17 11:35 | Tere-Apisah, Abigail v Sizikova, Yana | 6-3,6-2 |
| ITF Women Torino Qual | 2018/07/08 13:40 | Matteucci, Alice v Stamat, Vitalia | 6-3,6-3 |
| ITF Women Torino Qual | 2018/07/07 14:35 | Vicini, Alice v Stamat, Vitalia | 1-6,6-3,5-7 |
| ITF Women Fergana | 2018/06/19 08:35 | Kolar, Nastja v Stamat, Vitalia | 6-3,6-3 |
| ITF Women Fergana Qual | 2018/06/18 07:30 | Stamat, Vitalia v Khalimullina, Gulsina | 6-0,6-1 |
| ITF Women Fergana Qual | 2018/06/17 07:30 | Stamat, Vitalia v Ostrovskaya, Sofya | 6-2,3-6,6-4 |
| ITF Women Namangan Qual | 2018/06/04 12:15 | Stamat, Vitalia v Golubovskaya, Sofya | 1-6,3-6 |
| ITF Women Namangan Qual | 2018/06/02 05:00 | Stamat, Vitalia v Khalimullina, Gulsina | 6-0,6-2 |
| ITF Women Andijan Qual | 2018/05/27 10:30 | Stamat, Vitalia v Karimjanova, Yasmina | 6-1,4-6,0-6 |