| ITF W60 Canberra | 03/11 23:00 | 54 | Olivia Symons v Erina Hayashi | 6-2,1-6,4-6 | |
| ITF W40 Bhopal | 01/15 04:00 | 54 | [400] Gozal Ainitdinova v Erina Hayashi [398] | 7-6,7-5 | |
| ITF W60 Kyoto | 12/20 05:30 | 25 | [176] Misaki Doi v Erina Hayashi [475] | 6-1,6-3 | |
| ITF W25 Yokohama | 11/09 03:30 | 25 | [176] Na-Lae Han v Erina Hayashi [493] | 6-2,6-1 | |
| ITF W25 Yokohama | 11/08 01:00 | 54 | Erina Hayashi v Hina Nishi | 6-3,6-4 | |
| ITF W25 Yokohama | 11/07 04:45 | 54 | Akiko Omae v Erina Hayashi | 4-6,4-6 | |
| ITF W25 Hamamatsu | 10/10 04:00 | 62 | Erina Hayashi v Kayo Nishimura | 7-5,4-6,8-10 | |
| ITF W25 Hamamatsu | 10/09 00:00 | 62 | Erina Hayashi v Chisato Kanemaki | 6-4,6-3 | |
| ITF W60 San Bartolome De Tirajana | 08/08 08:30 | 54 | Claudia Hoste Ferrer v Erina Hayashi | 6-1,6-2 | |
| ITF W60 San Bartolome De Tirajana Qual | 08/07 08:25 | 54 | Laura Boehner v Erina Hayashi | 3-6,3-6 | |
| ITF W25 Santo Domingo | 06/09 13:00 | 25 | Erina Hayashi v Maria Lourdes Carle | 3-6,2-6 | |
| ITF W25 Santo Domingo | 06/03 12:50 | 25 | [342] Erina Hayashi v Maria Lourdes Carle [387] | 1-6,2-6 | |
| ITF W25 Pelham | 05/17 18:55 | 24 | [344] Erina Hayashi v Mirjam Bjorklund [331] | 1-6,7-6,1-6 | |
| ITF W100 Bonita Springs | 05/10 21:00 | 54 | [341] Erina Hayashi v Seone Mendez [268] | 2-6,6-7 | |
| ITF W60 Charlottesville | 04/26 18:10 | 54 | [345] Erina Hayashi v Amina Anshba [315] | 4-6,6-3,4-10 | |
| ITF W25 Yokohama | 03/03 06:10 | 25 | [322] Erina Hayashi v Dasha Ivanova [465] | 2-6,6-4,6-7 | |
| ITF W60 Kyoto | 02/22 00:45 | 28 | [208] Fang Ying Xun v Erina Hayashi [369] | 6-1,6-2 | |
| ITF W60 Kyoto | 02/21 01:00 | 27 | [369] Erina Hayashi v Risa Ushijima [391] | 6-0,6-2 | |
| ITF W60 Kyoto | 02/20 02:10 | 26 | [227] Kyoka Okamura v Erina Hayashi [369] | 1-6,6-4,4-6 | |
| ITF W60 Kyoto | 02/19 04:00 | 25 | [360] Haruna Arakawa v Erina Hayashi [369] | 6-2,2-6,6-7 | |
| ITF W60 Kyoto | 02/17 08:00 | 45 | Erina Hayashi v Yuka Hosoki | 7-6,6-2 | |
| ITF W60 Kyoto | 02/17 03:45 | 45 | Erina Hayashi v Megumi Nishimoto | 6-1,6-2 | |
| ITF W25 Hong Kong | 01/09 04:15 | 26 | [244] Anastasiya Komardina v Erina Hayashi [383] | 6-2,6-2 | |
| ITF W25 Hong Kong | 01/08 08:50 | 25 | [331] Sofya Lansere v Erina Hayashi [383] | 6-1,5-7,3-6 | |
| ITF W25 Hong Kong | 12/31 02:00 | 54 | Erina Hayashi v Sakura Hondo | 4-6,3-6 | |
| ITF W25 Hong Kong | 12/30 03:00 | 54 | Erina Hayashi v Justine S K T Leong | 7-5,6-3 | |
| Australian Open Women WC | 12/04 02:00 | 26 | [182] Na-Lae Han v Erina Hayashi [385] | 6-3,6-2 | |
| ITF W100 Tokyo | 11/13 04:00 | 25 | [393] Erina Hayashi v Xinyu Wang [154] | 5-7,3-6 | |
| ITF W100 Tokyo | 11/11 06:40 | 45 | [395] Erina Hayashi v Michika Ozeki [475] | 6-3,4-6,10-7 | |
| ITF W100 Tokyo | 11/11 02:55 | 45 | [395] Erina Hayashi v Ji-Hee Choi [184] | 2-6,6-2,10-5 |