Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF Women Hua Hin Qual | 2018/04/30 02:30 | Mananchaya Sawangkaew v Cai, Xinyu | 6-2,2-6,0-6 |
| ITF Women Hua Hin Qual | 2018/04/29 06:00 | Cai, Xinyu v Joleta Budiman | 6-1,6-2 |
| ITF Women Nanjing Qual | 2018/03/31 01:30 | Cai, Xinyu v Ma, Shuyue | 5-7,3-6 |
| ITF Women Nanjing Qual | 2018/03/24 01:30 | You, Mi Zhuoma v Cai, Xinyu | 2-6,6-1,6-2 |
| ITF Women Nanjing | 2018/03/18 07:30 | Cai, Xinyu v Oleksandra Oliynykova | 3-6,6-4,4-6 |
| ITF Women Nanjing | 2018/03/17 02:30 | Cai, Xinyu v Xin, Chunxi | 6-3,6-4 |
| ITF Women Xiamen | 2018/02/25 04:30 | Cao, Siqi v Cai, Xinyu | 4-6,6-3,6-3 |
| Antalya, Qualifications Simples W-WITF-TUR-46A | 2017/12/17 07:45 | Cai, Xinyu v Mishina, Daria | 2-6,5-7 |
| ITF Women Nanjing Qual | 2018/04/02 02:00 | Ng, Kwan Yau v Emma Raducanu | 4-6,1-6 |
| ITF Women Nanjing Qual | 2018/04/01 02:00 | Ng, Kwan Yau v Yang, Qian | 6-4,6-1 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 04:00 | Kang, Jia-Qi v Ng, Kwan Yau | 6-0,2-6,7-5 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/17 04:00 | Furuya, Michiru v Ng, Kwan Yau | 6-2,7-5 |
| ITF Women Toyota Qual | 2018/03/10 01:00 | Ng, Kwan Yau v Jeong, Sunam | 2-6,5-7 |
| ITF Women Xiamen | 2018/02/26 02:00 | Ng, Kwan Yau v Scandalis, Zoe Gwen | 3-6,1-6 |
| ITF Women Xiamen | 2018/02/25 02:00 | Ng, Kwan Yau v He, Jiahuan | 6-2,6-1 |
| Fed Cup, Groupe Mondial | 2018/02/07 05:55 | Yulia Putintseva v Ng, Kwan Yau | 6-1,6-0 |