Stadium: Centre Court Darmstadt Round: 54
| ITF Women Darmstadt Qual | 2018/07/15 13:00 | Cheong, Naomi v Stoll, Tatjana | 7-5,6-3 |
| ITF Women Aschaffenburg Qual | 2018/07/02 13:10 | Cheong, Naomi v Halbauer, Elizabeth | 2-6,1-6 |
| ITF Women Gifu Qual | 2018/04/29 02:40 | Akiko Omae v Cheong, Naomi | 6-2,6-4 |
| Quanzhou, Qualifications Simples W-WITF-CHN-04B | 2018/04/21 02:00 | Cheong, Naomi v Sun, Ziyue | 6-7,4-6 |
| ITF Women Kashiwa Qual | 2018/04/01 04:30 | Silich, Alina v Cheong, Naomi | 6-2,4-6,6-2 |
| ITF Women Toyota Qual | 2018/03/10 08:00 | Momoko Kobori v Cheong, Naomi | 6-0,6-0 |
| Yokohama, Singles Qualifying W-WITF-JPN-01B | 2018/03/05 01:00 | Momoko Kobori v Cheong, Naomi | 6-4,6-3 |
| ITF Women Tokyo | 2017/11/10 02:00 | Dalma Galfi v Cheong, Naomi | 6-3,6-3 |
| ITF Women Darmstadt Qual | 2018/07/16 10:00 | Hering, Katharina v Koelzer, Romy | 3-6,7-5,3-6 |
| ITF Women Getxo | 2018/07/13 09:00 | Gonzalez, Montserrat v Koelzer, Romy | 6-2,6-2 |
| ITF Women Getxo | 2018/07/11 10:00 | Koelzer, Romy v Marina Bassols Ribera | 6-4,6-3 |
| ITF Women Getxo | 2018/07/09 09:20 | Koelzer, Romy v Daria Lodikova | 6-3,6-1 |
| ITF Women Getxo Qual | 2018/07/08 10:45 | Koelzer, Romy v Crivelletto, Jessica | 1-6,6-2,7-5 |
| ITF Women Getxo Qual | 2018/07/07 09:00 | Koelzer, Romy v Molina Megias, Carlota | 6-3,6-2 |
| ITF Women Bastad | 2018/06/28 10:30 | Koelzer, Romy v Isabella Shinikova | 6-4,3-6,1-6 |
| ITF Women Bastad | 2018/06/26 08:45 | Koelzer, Romy v Zmau, Michele Alexandra | 1-6,6-1,7-5 |