Stadium: Court B Round: 25
| Yokohama, Singles Qualifying W-WITF-JPN-01B | 2017/03/05 06:00 | Takayama, Chihiro v Takahata, Kotomi | 3-6,7-5,2-6 |
| ITF Women Nanao | 2018/08/26 08:30 | Yidi Yang v Takayama, Chihiro | 6-1,6-3 |
| ITF Women Gimcheon | 2018/08/22 01:00 | Takayama, Chihiro v Hwiwon Wi | 4-6,0-6 |
| ITF Women Gimcheon | 2018/08/21 01:00 | Takayama, Chihiro v Ashmitha Easwaramurthi | 6-3,6-3 |
| ITF Women Gimcheon | 2018/08/20 02:00 | Uberoi, Nikita v Takayama, Chihiro | 3-6,3-6 |
| ITF Women Gimcheon | 2018/08/19 01:00 | Takayama, Chihiro v Kim, Sandeul | 6-3,6-2 |
| ITF Women Gimcheon | 2018/08/13 01:00 | Kim, S. v Takayama, Chihiro | 6-0,3-6,6-2 |
| ITF Women Jakarta | 2018/07/18 03:00 | Takayama, Chihiro v Oshino, Suzuho | 7-6,3-6,2-6 |
| ITF Women Jakarta | 2018/07/16 03:00 | Takayama, Chihiro v Mcblane, Rhiannon | 6-4,6-1 |
| ITF Women Nanao | 2018/08/29 05:20 | Takahata, Kotomi v Haruka Kaji | 6-7,2-6 |
| ITF Women Nanao | 2018/08/27 01:00 | Takahata, Kotomi v Shuto, Minami | 7-6,6-3 |
| ITF Women Nanao | 2018/08/26 03:25 | Takahata, Kotomi v Ayano Sonoda | 6-4,6-0 |
| Tsukuba, Singles W-WITF-JPN-09A | 2018/08/19 03:00 | So, Kumi v Takahata, Kotomi | 6-4,6-4 |
| ITF Women Taipei | 2018/07/24 03:55 | Chan, Chin-Wei v Takahata, Kotomi | 4-6,6-3,6-3 |
| ITF Women Astana Qual | 2018/07/14 10:45 | Kruzhkova, Daria v Takahata, Kotomi | 6-2,6-1 |
| ITF Women Tianjin Qual | 2018/07/09 02:00 | Takahata, Kotomi v Mei Xu Wu | 3-6,6-2,2-6 |
| ITF Women Tianjin Qual | 2018/07/08 06:35 | Takahata, Kotomi v Yang, Qian | 6-0,6-2 |