Japan Open was played 29/07/2018 in Ota City Industrial Plaza “PIO”, Tokyo, Japan with 136 men, 74 women and 18 open youth (boys/girls)
WDF Tables updated with these results 19/08/2018
| MEN’S SINGLES | Country | Position | WOMEN’S SINGLES | Country |
| Hiroshi Tanji | Japan | 1 | Mikuru Suzuki | Japan |
| Chris White | USA | 2 | Areum Kim | South Korea |
| Yuya Higuchi | Japan | 3 | Kazue Kimoto | Japan |
| Ken Kajii | Japan | 3 | Naomi Saito | Japan |
| Tatsuki Goga | Japan | 5 | Asako Atarashi | Japan |
| Yuichiro Ogawa | Japan | 5 | Tomoko Hirayanagi | Japan |
| Kazuya Uchida | Japan | 5 | Sayaka Kameo | Japan |
| Nobuhiro Yamamoto | Japan | 5 | Mana Kawakami | Japan |
| Ryuta Arihara | Japan | 9 | Mayu Aoki | Japan |
| Yuya Goto | Japan | 9 | Akiko Furuse | Japan |
| Atsushi Honma | Japan | 9 | Hannah Lee | South Korea |
| Syuhei Matsubara | Japan | 9 | Kanae Ishikawa | Japan |
| Yohei Miyagi | Japan | 9 | Hyojin Kin | South Korea |
| Ryuichiro Shimabe | Japan | 9 | Takako Kogama | Japan |
| Masaki Takahashi | Japan | 9 | YeonJoo Ro | South Korea |
| Tokuyo Takayama | Japan | 9 | Miho Sakata | Japan |
| Position | OPEN YOUTH SINGLES | Country | B/G |
| 1 | Syusaku Nakamura | Japan | B |
| 2 | Hidehiko Ishimori | Japan | B |
| 3 | Rei Matsumoto | Japan | B |
| 3 | Towa Suzuki | Japan | B |