| ITF W25 Nanao | 09/27 02:40 | 25 | Sawayanagi, Riko v 카지, 하루카 | 1-6,4-6 | |
| ITF W15 Yeongwol | 09/08 01:00 | 26 | Sawayanagi, Riko v 나미가타, 준리 | 2-6,6-3,4-6 | |
| ITF W15 Yeongwol | 09/07 02:10 | 25 | Gyeong Seo Lee v Sawayanagi, Riko | 3-6,6-7 | |
| ITF W15 Yeongwol | 09/01 00:55 | 26 | 김, 다빈 v Sawayanagi, Riko | 3-6,7-5,6-4 | |
| ITF W15 Yeongwol | 08/30 03:00 | 25 | Sawayanagi, Riko v Haram Kim | 6-0,6-2 | |
| ITF W25 Goyang | 08/25 06:40 | 26 | 코바피투크테드, 푼닌 v Sawayanagi, Riko | 6-4,6-2 | |
| ITF W25 Goyang | 08/23 02:30 | 25 | 박, 수빈 v Sawayanagi, Riko | 4-6,1-6 | |
| ITF W15 Chiang Rai | 06/16 04:40 | 26 | Sawayanagi, Riko v 쉰, 팡잉 | 3-6,3-6 | |
| ITF W15 Chiang Rai | 06/14 05:10 | 25 | Sawayanagi, Riko v 카와기시, 나나 | 6-3,6-3 | |
| ITF W25 Chiang Rai | 06/07 03:40 | 44 | 시미즈, 에리 v Sawayanagi, Riko | 3-6,7-5,11-9 | |
| ITF W25 Chiang Rai Qual | 06/06 05:35 | 44 | Wongteanchai, Varunya v Sawayanagi, Riko | 6-2,6-7,6-10 | |
| ITF W25 Chiang Rai Qual | 06/05 06:50 | 44 | Waraporn Muangpho v Sawayanagi, Riko | 0-6,0-6 | |
| ITF W25 Chiang Rai | 06/02 02:00 | 26 | 아라카와 H, 하루나 v Sawayanagi, Riko | 6-4,6-0 | |
| ITF W25 Chiang Rai | 06/01 04:05 | 25 | Sawayanagi, Riko v 수크호티나, 아나스타시아 | 1-6,6-1,7-5 | |
| ITF W25 Chiang Rai | 05/31 05:45 | 44 | Sawayanagi, Riko v Chilumula, Nidhi | 6-4,6-0 | |
| ITF W25 Chiang Rai | 05/30 05:10 | 44 | Sawayanagi, Riko v 마나타비왓, 라다 | 6-1,6-4 | |
| ITF W15 Antalya | 04/20 07:00 | 25 | 가르쿠사, 에바 v Sawayanagi, Riko | 6-2,4-6,6-2 | |
| ITF W15 Antalya | 04/12 11:00 | 25 | Sawayanagi, Riko v Szabanin, Natalia | 1-6,1-6 | |
| ITF W25 Antalya | 04/03 07:00 | 62 | Sawayanagi, Riko v Pochtovyk, Krystyna | Retired | |
| ITF W25 Antalya | 03/28 07:00 | 62 | Sawayanagi, Riko v Gonzalez Encinas, Marta Huqi | 0-6,4-6 | |
| ITF W25 Antalya | 03/27 07:00 | 62 | Sawayanagi, Riko v Javiera Verdugo | 6-1,6-1 | |
| ITF W25 Antalya | 03/22 07:00 | 62 | Sawayanagi, Riko v 데솔리스, 발바라 | 6-3,3-6,8-10 | |
| ITF W25 Antalya | 03/21 07:00 | 62 | Sawayanagi, Riko v Bianca Bulat | 6-2,6-1 | |
| ITF W25 Cairo | 01/26 12:55 | 25 | 우레크, 안나 v Sawayanagi, Riko | 7-5,7-6 | |
| ITF W25 Cairo | 01/25 09:45 | 62 | 나기, 아드리엔 v Sawayanagi, Riko | 6-1,6-7,5-10 | |
| ITF W25 Cairo | 01/24 12:00 | 62 | Charl, Maria v Sawayanagi, Riko | 1-6,1-6 | |
| ITF W15 Cairo | 01/20 09:50 | 26 | Sawayanagi, Riko v 크라우스, 신자 | 2-6,5-7 | |
| ITF W15 Cairo | 01/19 13:00 | 25 | Sawayanagi, Riko v Joody Elkady | 6-1,6-0 | |
| ITF W15 Cairo | 01/18 09:35 | 62 | Sawayanagi, Riko v Camille Moga | 6-2,6-2 | |
| ITF W15 Cairo | 01/14 10:00 | 27 | 우레크, 안나 v Sawayanagi, Riko | 7-6,6-3 |