| Daegu, Singles W-ITF-KOR-04A | 06/07 02:30 | 25 | [438] Sawayanagi, Riko v 리앙, 언 수어 [290] | 6-7,0-6 | |
| Gifu, Singles W-ITF-JPN-09A | 05/01 02:45 | 54 | 코바야시, 호노카 v Sawayanagi, Riko | Retired | |
| ITF W15 Fukui | 04/27 00:55 | 26 | Rinon Okuwaki v Sawayanagi, Riko | 3-6,6-2,6-3 | |
| ITF W15 Fukui | 04/25 02:00 | 25 | 타카야마, 치히로 v Sawayanagi, Riko | 5-7,0-6 | |
| Osaka, Singles W-ITF-JPN-02A | 04/12 09:30 | 25 | [298] 여우, 시아우디 v Sawayanagi, Riko [425] | 6-1,6-1 | |
| Osaka, Singles W-ITF-JPN-02A | 04/10 04:50 | 62 | Gyeong Seo Lee v Sawayanagi, Riko | 4-6,2-6 | |
| Osaka, Singles W-ITF-JPN-02A | 04/10 01:00 | 62 | 야마구치, 아이 v Sawayanagi, Riko | 2-6,4-6 | |
| Osaka, Singles W-ITF-JPN-02A | 04/09 01:00 | 62 | Ozeki, Ayaka v Sawayanagi, Riko | 0-6,0-6 | |
| ITF W60 Canberra | 03/21 03:00 | 25 | [461] Sawayanagi, Riko v 자쿠포비치, 다릴라 [218] | 2-6,2-6 | |
| ITF W60 Canberra | 03/20 00:25 | 54 | [366] 양, 야-이 v Sawayanagi, Riko [486] | 6-3,0-6,1-6 | |
| ITF W60 Canberra Qual | 03/18 23:00 | 54 | 프리, 소피아 v Sawayanagi, Riko | 0-6,0-6 | |
| ITF W60 Canberra | 03/15 23:00 | 26 | [322] 카지, 하루카 v Sawayanagi, Riko [486] | 6-2,4-6,6-2 | |
| ITF W60 Canberra | 03/13 23:00 | 25 | Sawayanagi, Riko v 라미알리슨, 이리나 | 7-5,7-5 | |
| ITF W60 Canberra | 03/13 00:35 | 54 | [486] Sawayanagi, Riko v 카와무라, 마나 [479] | 3-6,7-5,6-4 | |
| ITF W60 Canberra | 03/12 03:15 | 54 | Sawayanagi, Riko v Berezov, Anastasia | 6-3,6-1 | |
| ITF W15 Kuala Lumpur | 02/24 01:30 | 27 | 코시이시, 아유미 v Sawayanagi, Riko | 6-3,7-6 | |
| ITF W15 Kuala Lumpur | 02/23 01:30 | 26 | Caroline Vernet v Sawayanagi, Riko | 1-6,1-6 | |
| ITF W15 Kuala Lumpur | 02/21 03:50 | 25 | Sawayanagi, Riko v Ito, Aoi | 7-5,6-0 | |
| ITF W15 Ipoh | 02/16 01:30 | 26 | Sawayanagi, Riko v Daniel, Jaeda | 5-7,4-6 | |
| ITF W15 Ipoh | 02/14 04:40 | 25 | Sawayanagi, Riko v Yang, Vivian | 6-4,6-0 | |
| ITF W25 Burnie | 02/08 23:00 | 26 | [152] Gadecki, Olivia v Sawayanagi, Riko [496] | 6-3,4-6,6-2 | |
| ITF W25 Burnie | 02/07 00:30 | 25 | [484] 시미즈, 에리 v Sawayanagi, Riko [496] | 3-6,5-7 | |
| ITF W25 Burnie | 02/06 01:30 | 54 | Yaroslava Bartashevich v Sawayanagi, Riko | 4-6,1-6 | |
| Burnie, Singles W-ITF-AUS-02A | 01/30 00:20 | 54 | Sawayanagi, Riko v Elena Micic | 6-2,4-6,3-6 | |
| ITF W40 Nonthaburi | 01/02 03:00 | 54 | Sawayanagi, Riko v 쳅찬데이, 패트차린 | 2-6,1-6 | |
| ITF W40 Nonthaburi | 01/01 02:00 | 54 | 쿠와타, 히로코 v Sawayanagi, Riko | 6-7,4-6 | |
| ITF W60 Tokyo | 11/16 04:00 | 25 | Sawayanagi, Riko v 우치지마, 모유카 | 3-6,3-6 | |
| ITF W25 Yokohama | 11/08 03:00 | 54 | 카토, 미유 v Sawayanagi, Riko | 6-3,6-2 | |
| ITF W25 Yokohama | 11/07 05:05 | 54 | 사이고, 유키나 v Sawayanagi, Riko | 1-6,4-6 | |
| ITF W25 Makinohara | 10/04 02:00 | 25 | 야마자키, 이쿠미 v Sawayanagi, Riko | Retired |