Stadium: Court 4 Round: 26 Ground: Clay
| ITF - W15 Antalya | 2019/01/25 14:10 | Cao, Siqi v Zeynep Sonmez | 6-0,6-2 |
| Shenzhen, Simples W-WITF-CHN-02A | 2018/11/04 02:30 | Cao, Siqi v Emily Webley-Smith | 2-6,4-6 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/10/15 12:00 | Matvienko, Lisa v Cao, Siqi | 6-3,6-4 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/10/14 16:30 | Alessandra Crump v Cao, Siqi | 2-6,1-6 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/10/07 09:00 | Scala, Camilla v Cao, Siqi | 2-6,6-4,6-4 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/10/02 13:30 | Cao, Siqi v Carson Branstine | 2-6,1-6 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/09/23 16:30 | Jule Niemeier v Cao, Siqi | 6-4,6-1 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/09/16 13:30 | Tatiana Pieri v Cao, Siqi | 6-2,4-6,7-5 |
| ITF - W15 Antalya | 2019/01/25 09:25 | Honoka Kobayashi v Dema, Viktoriia | 6-2,6-4 |
| ITF - W15 Antalya | 2019/01/23 07:00 | Honoka Kobayashi v Kong, Qianxin | 6-3,6-2 |
| ITF - W15 Antalya | 2019/01/22 11:00 | Jessica Marmorstein v Honoka Kobayashi | 0-6,0-6 |
| ITF - W15 Antalya | 2019/01/17 09:00 | Honoka Kobayashi v Vlada Ekshibarova | 2-6,3-6 |
| ITF - W15 Antalya | 2019/01/16 12:10 | Honoka Kobayashi v Giulia Carbonaro | 7-5,6-2 |
| ITF - W15 Antalya | 2019/01/14 07:00 | Erman, Zeynep v Honoka Kobayashi | 1-6,0-6 |
| Hamamatsu, Singles W-WITF-JPN-12A | 2018/10/14 00:00 | Anri Nagata v Honoka Kobayashi | 6-2,6-4 |
| Makinohara, Singles Qualifying W-WITF-JPN-15A | 2018/10/08 02:05 | Honoka Kobayashi v Erina Hayashi | 6-7,4-6 |