【Full Leaderboard】 Update 05/20 15:14
23rd Japan Senior Open Golf Championship 2013
| ROUND 4 | @：Amateur player |
| POS | Player | Score | Rounds | Total | |||
| R1 | R2 | R3 | R4 | ||||
| - | Mitsuyasu Kojima | +9 | 77 | 76 | - | - | - |
| - | Kosei Sakai | +9 | 78 | 75 | - | - | - |
| - | Yoshio Fumiyama | +9 | 71 | 82 | - | - | - |
| - | Yuji Takagi | +9 | 77 | 76 | - | - | - |
| - | Satoshi Oide | +9 | 75 | 78 | - | - | - |
| - | Kazunari Itamoto | +9 | 73 | 80 | - | - | - |
| - | Katsuhito Takagi | +9 | 77 | 76 | - | - | - |
| - | Shuichi Sano | +9 | 72 | 81 | - | - | - |
| - | Takashi Miyoshi | +9 | 77 | 76 | - | - | - |
| - | Gohei Sato | +9 | 77 | 76 | - | - | - |
| - | Teruo Nakamura | +10 | 74 | 80 | - | - | - |
| - | Isao Aoki | +10 | 77 | 77 | - | - | - |
| - | Tim Thelen | +10 | 78 | 76 | - | - | - |
| - | Koichi Suzuki | +10 | 79 | 75 | - | - | - |
| - | Toshikazu Fukuda | +10 | 77 | 77 | - | - | - |
| - | Dragon Taki | +10 | 76 | 78 | - | - | - |
| - | Setsuo Hamada | +11 | 73 | 82 | - | - | - |
| - | Toshio Shimamura | +11 | 77 | 78 | - | - | - |
| - | Yasuo Sone | +11 | 78 | 77 | - | - | - |
| - | Toshiaki Nakagawa | +12 | 77 | 79 | - | - | - |
| - | Atsushi Shizawa | +12 | 81 | 75 | - | - | - |
| - | Koji Kobayashi | +12 | 78 | 78 | - | - | - |
| - | Mikio Ichikawa | +12 | 76 | 80 | - | - | - |
| - | Hiroshi Fujita | +13 | 80 | 77 | - | - | - |
| - | Masatsugu Myojin | +13 | 78 | 79 | - | - | - |
| - | Yukihiro Hashitate | +14 | 77 | 81 | - | - | - |
| - | Teruyasu Hayashi | +14 | 75 | 83 | - | - | - |
| - | Toshiomi Inaba | +14 | 79 | 79 | - | - | - |
| - | @ Kanji Okunaka | +15 | 78 | 81 | - | - | - |
| - | @ Toshiki Sakiyama | +15 | 82 | 77 | - | - | - |
| - | @ Satoshi Hato | +15 | 76 | 83 | - | - | - |
| - | Yoshinori Kaneko | +16 | 77 | 83 | - | - | - |
| - | Yoshiharu Ota | +16 | 80 | 80 | - | - | - |
| - | Yasuhiro Okumura | +16 | 78 | 82 | - | - | - |
| - | Shunro Watatani | +17 | 77 | 84 | - | - | - |
| - | @ Woo Kang | +17 | 78 | 83 | - | - | - |
| - | Yoichi Sakata | +18 | 75 | 87 | - | - | - |
| - | Koichi Hirabayashi | +18 | 83 | 79 | - | - | - |
| - | Michitaka Tanaami | +21 | 84 | 81 | - | - | - |
| - | @ Hisashi Nakahigashi | +22 | 79 | 87 | - | - | - |
| - | Minoru Kato | +22 | 79 | 87 | - | - | - |
| - | @ Hiroto Mita | +25 | 85 | 84 | - | - | - |
| - | @ Junichi Chiba | +25 | 84 | 85 | - | - | - |
| - | Takahiro Kawase | +31 | 86 | 89 | - | - | - |
| - | @ Kazushi Miyakawa | +32 | 88 | 88 | - | - | - |