Stadium: Court 2 Round: 25 Ground: Clay
| Moscow, Singles W-WITF-RUS-05A | 2018/08/22 11:30 | Sizikova, Yana v Valeriya Yushchenko | 4-6,1-6 |
| ITF Women Minsk | 2018/11/05 09:40 | Paulenka, Katyarina v Valeriya Yushchenko | 1-6,1-6 |
| ITF Women Minsk | 2018/11/04 14:25 | Cernecka, Alise v Valeriya Yushchenko | 3-6,5-7 |
| Istanbul, Singles W-WITF-TUR-28B | 2018/10/21 10:00 | Ekaterina Kazionova v Valeriya Yushchenko | 3-6,2-6 |
| Istanbul, Singles W-WITF-TUR-28B | 2018/10/20 08:00 | Gebriela Mihaylova v Valeriya Yushchenko | 4-6,1-6 |
| Antalya, Singles Qualifying W-WITF-TUR-08A | 2018/09/25 09:20 | Valeriya Yushchenko v Behulova, Bianca | 6-4,6-1 |
| ITF Women Dobrich | 2018/09/19 12:25 | Amina Anshba v Valeriya Yushchenko | 6-4,6-4 |
| ITF Women Dobrich | 2018/09/17 06:30 | Melanie Klaffner v Valeriya Yushchenko | 5-7,2-6 |
| Moscow, Singles W-WITF-RUS-05A | 2018/08/25 07:00 | Valeriya Yushchenko v Ekaterina Makarova | 6-0,6-0 |
| WTA - Mumbaï | 2018/10/27 06:50 | Jain, Mahak v Sizikova, Yana | 3-6,6-3,7-5 |
| Tianjin, Chine | 2018/10/06 06:40 | Sizikova, Yana v Honcova, Michaela | 6-4,6-2 |
| Almaty, Singles Qualifying W-WITF-KAZ-01A | 2018/08/30 05:00 | Hatouka, Yuliya v Sizikova, Yana | 7-5,6-1 |
| Almaty, Singles Qualifying W-WITF-KAZ-01A | 2018/08/29 06:35 | Daria Lodikova v Sizikova, Yana | 1-6,6-7 |
| Almaty, Singles Qualifying W-WITF-KAZ-01A | 2018/08/28 10:15 | Mihalikova, Tereza v Sizikova, Yana | 3-6,5-7 |
| Moscow, Singles W-WITF-RUS-05A | 2018/08/22 11:30 | Sizikova, Yana v Valeriya Yushchenko | 4-6,1-6 |
| Moscow, Singles W-WITF-RUS-05A | 2018/08/20 07:00 | Sizikova, Yana v Stamat, Vitalia | 6-0,6-2 |
| ITF Women LPD Gran Canaria | 2018/08/09 10:00 | Irene Burillo Escorihuela v Sizikova, Yana | 6-1,3-6,7-6 |