【Full Leaderboard】 Update 10/17 10:40
51st Japan Women's Open Golf Championship 2018
| ROUND 4 | @：Amateur player |
| POS | Player | Score | Rounds | Total | |||
| R1 | R2 | R3 | R4 | ||||
| - | Mio Kotaki | +4 | 76 | 72 | - | - | - |
| - | Hae-Rym Kim | +4 | 74 | 74 | - | - | - |
| - | Sakura Koiwai | +4 | 73 | 75 | - | - | - |
| - | @ Riri Sadoyama | +4 | 74 | 74 | - | - | - |
| - | Megumi Shimokawa | +4 | 75 | 73 | - | - | - |
| - | Sakura Kito | +4 | 78 | 70 | - | - | - |
| - | Hiromu Ono | +4 | 73 | 75 | - | - | - |
| - | Ayana Kon | +4 | 71 | 77 | - | - | - |
| - | @ Hinano Hoshikawa | +4 | 75 | 73 | - | - | - |
| - | Hiroko Azuma | +4 | 71 | 77 | - | - | - |
| - | @ Narumi Uetake | +4 | 72 | 76 | - | - | - |
| - | Shinobu Moromizato | +5 | 76 | 73 | - | - | - |
| - | Yoko Ogawa | +5 | 75 | 74 | - | - | - |
| - | Yuko Fukuda | +5 | 78 | 71 | - | - | - |
| - | In-Kyung Kim | +5 | 73 | 76 | - | - | - |
| - | Mamiko Higa | +5 | 74 | 75 | - | - | - |
| - | Yukari Nishiyama | +5 | 74 | 75 | - | - | - |
| - | Hyo-Joo Kim | +5 | 78 | 71 | - | - | - |
| - | Minami Hiruta | +6 | 75 | 75 | - | - | - |
| - | Miyuki Takeuchi | +6 | 73 | 77 | - | - | - |
| - | Seira Oki | +6 | 77 | 73 | - | - | - |
| - | Pei-Ying Tsai | +6 | 74 | 76 | - | - | - |
| - | Tsugumi Miyazaki | +6 | 75 | 75 | - | - | - |
| - | Naruha Miyata | +6 | 76 | 74 | - | - | - |
| - | Rei Matsuda | +6 | 75 | 75 | - | - | - |
| - | @ Mayu Wakui | +7 | 74 | 77 | - | - | - |
| - | Hinako Yamauchi | +7 | 75 | 76 | - | - | - |
| - | Haruka Kudo | +7 | 74 | 77 | - | - | - |
| - | Sun-Ju Ahn | +7 | 72 | 79 | - | - | - |
| - | @ Hana Chiba | +7 | 79 | 72 | - | - | - |
| - | @ Yuzuki Okubo | +7 | 79 | 72 | - | - | - |
| - | Ayaka Matsumori | +7 | 74 | 77 | - | - | - |
| - | Fumika Kawagishi | +8 | 77 | 75 | - | - | - |
| - | O.Sattaya | +8 | 76 | 76 | - | - | - |
| - | Risa Ogusu | +8 | 76 | 76 | - | - | - |
| - | Momoko Osato | +8 | 79 | 73 | - | - | - |
| - | @ Amiyu Ozeki | +8 | 75 | 77 | - | - | - |
| - | Hikaru Yoshimoto | +9 | 79 | 74 | - | - | - |
| - | @ Fumie Jo | +9 | 79 | 74 | - | - | - |
| - | @ Sae Ogura | +9 | 77 | 76 | - | - | - |
| - | Hikari Tanabe | +9 | 76 | 77 | - | - | - |
| - | @ Nanako Inagaki | +9 | 74 | 79 | - | - | - |
| - | Rieko Sakashita | +9 | 77 | 76 | - | - | - |
| - | @ Minori Iwasaki | +9 | 78 | 75 | - | - | - |
| - | Juria Kurata | +10 | 81 | 73 | - | - | - |
| - | Mayu Hattori | +10 | 80 | 74 | - | - | - |
| - | Rie Tsuji | +10 | 77 | 77 | - | - | - |
| - | Ayano Yasuda | +10 | 79 | 75 | - | - | - |
| - | Erika Hara | +10 | 77 | 77 | - | - | - |
| - | Nene Gotoda | +10 | 79 | 75 | - | - | - |
| - | Yoshimi Koda | +11 | 81 | 74 | - | - | - |
| - | @ Hanane Nagashima | +11 | 80 | 75 | - | - | - |
| - | @ Suguka Kawanaka | +12 | 78 | 78 | - | - | - |
| - | Yumiko Baba | +12 | 80 | 76 | - | - | - |
| - | Eri Joma | +14 | 79 | 79 | - | - | - |
| - | Miki Nishiyama | +15 | 81 | 78 | - | - | - |