Stadium: Court 3 Round: 26 Ground: Hardcourt outdoor
| WTA Doha WD | 2018/02/16 12:30 | Krejcikova/Siniakova v Kato/Ninomiya | 7-6,6-1 |
| WTA Doha WD | 2018/02/14 15:20 | Kato/Ninomiya v Chan/Hlavackova | 6-1,6-3 |
| WTA Doha WD | 2018/02/13 17:00 | Al Nabhani/Rompies v Kato/Ninomiya | 4-6,0-6 |
| 2018 Fed Cup | 2018/02/10 08:20 | Diyas/Putintseva v Kato/Ninomiya | 4-6,5-7 |
| 2018 Fed Cup | 2018/02/09 07:55 | Hsu/Lee v Kato/Ninomiya | 2-6,6-7 |
| 2018 Fed Cup | 2018/02/08 08:25 | Kato/Ninomiya v Kim/Lee | 6-2,6-2 |
| Billie Jean King Cup | 2018/02/07 08:30 | Kato/Ninomiya v Lertpitaksinchai/Plipuech | 6-3,6-3 |
| WTA Taipei WD | 2018/01/29 09:50 | Hon/Jakupovic v Kato/Ninomiya | 6-3,3-6,10-7 |