| ITF W100 Shenzhen | 11/04 03:50 | 54 | [401] Erina Hayashi v Diane Parry [326] | 3-6,4-6 | |
| ITF W60 Playford | 10/29 02:40 | 25 | [401] Erina Hayashi v Abbie Myers [329] | 6-3,1-6,1-6 | |
| ITF W60 Bendigo | 10/22 23:00 | 25 | Erina Hayashi v Sara Tomic | 6-7,0-6 | |
| ITF W60 Bendigo | 10/21 23:00 | 54 | Erina Hayashi v Laura Ashley | 4-6,6-1,6-10 | |
| ITF W60 Bendigo | 10/20 23:00 | 54 | Erina Hayashi v Noelleda Ah San | 6-1,6-2 | |
| ITF W25 Makinohara | 10/11 00:30 | 27 | [94] Paula Badosa v Erina Hayashi [415] | 6-1,4-6,6-1 | |
| ITF W25 Makinohara | 10/10 02:35 | 26 | Eri Shimizu v Erina Hayashi | 5-7,1-6 | |
| ITF W25 Makinohara | 10/09 02:10 | 25 | Honoka Kobayashi v Erina Hayashi | 2-6,4-6 | |
| WTA Hiroshima | 09/08 02:00 | 45 | [435] Erina Hayashi v Leylah A Fernandez [233] | 0-6,4-6 | |
| ITF W25 Kyoto | 09/03 02:25 | 25 | Erina Hayashi v Nagi Hanatani | 5-7,6-4,2-6 | |
| ITF W25 Nanao | 08/30 04:00 | 27 | [359] Junri Namigata v Erina Hayashi [435] | 6-3,6-2 | |
| ITF W25 Nanao | 08/29 02:00 | 26 | [435] Erina Hayashi v Yuki Naito [251] | 7-6,6-3 | |
| ITF W25 Nanao | 08/27 04:55 | 25 | Erina Hayashi v Hiromi Abe | 6-4,3-6,6-0 | |
| ITF W25 Tsukuba | 08/22 02:20 | 26 | [273] Momoko Kobori v Erina Hayashi [435] | 7-6,7-5 | |
| ITF W25 Tsukuba | 08/20 04:55 | 25 | [494] Yuuki Tanaka v Erina Hayashi [435] | 6-1,3-6,2-6 | |
| ITF W25 Taipei | 07/31 02:00 | 25 | [403] Erina Hayashi v Haruka Kaji [351] | 4-6,2-6 | |
| ITF W25 Aschaffenburg | 07/18 11:00 | 26 | Erina Hayashi v Ekaterina Makarova | 1-6,2-6 | |
| ITF W25 Aschaffenburg | 07/17 14:25 | 25 | [240] Quirine Lemoine v Erina Hayashi [419] | 2-6,4-6 | |
| ITF W25 Biella | 07/02 10:30 | 54 | [416] Erina Hayashi v Laura Pigossi [133] | 6-7,3-6 | |
| ITF W25 Biella | 07/01 08:00 | 54 | Erina Hayashi v Marie Mettraux | 6-4,6-4 | |
| ITF W25 Tarvisio | 06/25 09:25 | 54 | [420] Erina Hayashi v Rasheeda McAdoo [383] | 3-6,6-2,11-13 | |
| ITF W25 Hong Kong | 06/02 03:00 | 29 | [226] Jia-Jing Lu v Erina Hayashi [407] | Retired | |
| ITF W25 Hong Kong | 06/01 08:00 | 28 | Ho Ching Wu v Erina Hayashi | 5-7,1-6 | |
| ITF W25 Hong Kong | 06/01 02:00 | 27 | [407] Erina Hayashi v Momoko Kobori [254] | 7-5,6-2 | |
| ITF W25 Hong Kong | 05/31 05:20 | 26 | [294] Abigail Tere-Apisah v Erina Hayashi [407] | 6-7,1-6 | |
| ITF W25 Hong Kong | 05/30 02:00 | 25 | Erina Hayashi v Wing Kiu Jacqueline Lam | 6-1,6-0 | |
| ITF W25 Hong Kong | 05/28 08:00 | 54 | Erina Hayashi v Sakura Hosogi | 4-6,6-3,14-12 | |
| ITF W25 Karuizawa | 05/25 01:00 | 28 | [251] Momoko Kobori v Erina Hayashi [412] | 6-4,6-3 | |
| ITF W25 Karuizawa | 05/24 01:00 | 27 | [405] Naomi Broady v Erina Hayashi [412] | 3-6,2-6 | |
| ITF W25 Karuizawa | 05/23 01:00 | 26 | [412] Erina Hayashi v Kanako Morisaki [280] | 7-5,6-4 |