Stadium: C Round: 25
| ITF Women Ilkley Qual | 2018/06/17 10:00 | Freya Christie v Tammi Patterson | 7-6,6-1 |
| ITF Women Manchester Qual | 2018/06/10 10:00 | Allen, Victoria v Tammi Patterson | 6-2,6-3 |
| ITF Women Surbiton Qual | 2018/06/02 11:10 | Victoria Duval v Tammi Patterson | 6-7,6-1,6-2 |
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/26 02:00 | Momoko Kobori v Tammi Patterson | 5-7,6-4,6-4 |
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/25 01:00 | Tammi Patterson v Muhammad, Asia | 6-4,1-6,6-2 |
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/24 02:15 | Tammi Patterson v Nagi Hanatani | 6-3,6-3 |
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/22 01:00 | Tammi Patterson v Yoshitomi, Aiko | 6-4,6-4 |
| ITF Women Kurume | 2018/05/18 04:45 | Tammi Patterson v Myers, Abbie | 3-6,6-2,4-6 |
| ITF Women Klosters | 2018/06/19 08:00 | Sadikovic, Amra v Diana Marcinkevica | 6-4,6-0 |
| ITF Women Essen | 2018/06/12 12:00 | Pemra Ozgen v Diana Marcinkevica | 6-4,6-2 |
| ITF Women Brescia | 2018/06/05 12:50 | Diana Marcinkevica v Kayla Day | 6-0,6-1 |
| ITF Women Grado | 2018/05/28 08:30 | Renata Zarazua v Diana Marcinkevica | 6-2,6-7,6-2 |
| WTA Strasbourg Qual | 2018/05/18 11:55 | Jessica Pieri v Diana Marcinkevica | 3-6,7-5,6-3 |
| ITF Women Cagnes-Sur-Mer Qual | 2018/05/05 12:10 | Harmony Tan v Diana Marcinkevica | 7-6,6-4 |
| WTA Prague Qual | 2018/04/28 13:35 | Diana Marcinkevica v Doi, Misaki | 4-6,7-5,1-6 |
| ITF Women Wiesbaden | 2018/04/25 09:00 | Diana Marcinkevica v Isabella Shinikova | 4-6,6-3,3-6 |