Stadium: Stadium Round: 28 Ground: Hardcourt outdoor
| WTA San Jose WD | 2018/08/04 04:05 | Kato/Ninomiya v Garcia-Perez/Hon | 6-4,6-2 |
| WTA San Jose WD | 2018/08/02 00:00 | Kato/Ninomiya v Frech/Sanchez | 1-6,7-5,10-4 |
| 2018 Fed Cup | 2018/04/22 06:50 | Kato/Ninomiya v Konta/Watson | 3-6,6-3,6-3 |
| ITF Women Canberra WD | 2018/03/23 05:00 | Kato/Ninomiya v Hon/Jakupovic | 4-6,6-4,7-10 |
| ITF Women Canberra WD | 2018/03/22 03:45 | Kato/Ninomiya v Moore/Perez | 6-2,6-4 |
| ITF Women Canberra WD | 2018/03/21 03:40 | Kato/Ninomiya v Bains/Kennel | 6-4,6-1 |
| ITF Women Canberra WD | 2018/03/20 05:00 | Kato/Ninomiya v Bai/Hives | 1-6,6-3,10-6 |
| WTA Dubai WD | 2018/02/21 16:00 | Makarova/Vesnina v Kato/Ninomiya | 6-4,6-1 |