Stadium: Court 6 Round: 26 Ground: Clay
| ITF Women Hammamet | 2018/05/16 12:00 | Januskova, Petra v Suvrijn, Jade | 3-6,2-6 |
| ITF Women Charleston Qual | 2018/04/30 14:00 | Xu, Shilin v Januskova, Petra | 7-6,6-1 |
| ITF Women Charlottesville Qual | 2018/04/22 14:00 | Neel, Ingrid v Januskova, Petra | 6-4,6-2 |
| ITF Women Solarino | 2018/03/06 09:00 | Januskova, Petra v Koelzer, Romy | 2-6,6-3,5-7 |
| ITF Women Solarino | 2018/02/28 08:30 | Januskova, Petra v Tayisiya Morderger | 2-6,2-6 |
| ITF Women Solarino | 2018/02/27 11:55 | Januskova, Petra v Anastasia Abbagnato | 7-6,6-2 |
| ITF Women Solarino | 2018/02/20 10:00 | Palkina, Ksenia v Januskova, Petra | 6-4,6-4 |
| ITF Women Trnava | 2018/02/04 15:00 | Januskova, Petra v Sedlackova, Petra | 6-2,1-6,0-6 |
| ITF Women Hammamet | 2018/05/22 09:30 | Shimizu, Seira v Yana Morderger | 6-4,3-6,6-3 |
| ITF Women Hammamet | 2018/05/19 10:00 | Adithya Karunaratne v Shimizu, Seira | 6-7,6-1,4-6 |
| ITF Women Hammamet | 2018/05/13 09:00 | Shimizu, Seira v Wargnier, Lucie | 0-6,0-6 |
| Antalya, Singles Qualifying W-WITF-TUR-08A | 2016/02/24 10:10 | Shimizu, Seira v Perper, Alexandra | 4-6,1-6 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2015/08/12 14:30 | Claffey, Jennifer v Shimizu, Seira | 6-0,6-1 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2015/08/06 14:30 | Shimizu, Seira v Becker, Kseniia | 6-3,3-6,2-6 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2015/08/05 14:30 | Shimizu, Seira v Lazareva, Alina | 6-2,6-0 |