Stadium: Court 8 Round: 54 Ground: Hardcourt outdoor
| ITF W15 Hua Hin | 2019/10/09 04:25 | Ai Yamaguchi v Ya-Hsin Lee | 0-6,1-6 |
| ITF W15 Hua Hin | 2019/10/08 04:20 | Haine Ogata v Ai Yamaguchi | 3-6,6-7 |
| ITF W15 Hua Hin | 2019/10/07 05:20 | Kanyanut Sudsaard v Ai Yamaguchi | 0-6,0-6 |
| ITF W15 Anning Qual | 2019/09/22 05:20 | Soha Sadiq v Ai Yamaguchi | 6-4,6-4 |
| ITF W15 Jakarta | 2019/06/26 05:00 | Ai Yamaguchi v Aldila Sutjiadi | 4-6,0-6 |
| ITF W15 Jakarta | 2019/06/25 05:15 | Ai Yamaguchi v Sara Jamal | 6-0,6-1 |
| ITF W60 Kurume | 2019/05/13 00:30 | Ai Yamaguchi v Yuuki Tanaka | 2-6,0-6 |
| ITF Women Iizuka Qual | 2016/09/25 04:00 | Chihiro Nunome v Ai Yamaguchi | 6-0,6-2 |
| ITF W60 Kyoto | 2020/02/17 06:30 | Kisa Yoshioka v Honoka Kobayashi | 7-6,6-1 |
| ITF W60 Kyoto | 2020/02/17 00:00 | Kwan Yau Ng v Honoka Kobayashi | 3-6,4-6 |
| ITF W15 Antalya | 2020/01/29 13:45 | Honoka Kobayashi v Georgia Andreea Craciun | 3-6,5-7 |
| ITF W15 Antalya | 2020/01/29 06:00 | Honoka Kobayashi v Martina Biagianti | 6-3,5-7,10-8 |
| ITF W15 Antalya | 2020/01/26 07:00 | Honoka Kobayashi v Ayano Sonoda | 6-1,6-2 |
| ITF W15 Antalya | 2020/01/24 07:00 | Honoka Kobayashi v Valeriya Olyanovskaya | 0-6,0-6 |
| ITF W15 Antalya | 2020/01/23 07:00 | Honoka Kobayashi v Ayla Aksu | 6-7,7-6,6-2 |
| ITF W15 Antalya | 2020/01/21 09:00 | Barbora Miklova v Honoka Kobayashi | 3-6,6-2,6-7 |