| Year | Tour(s) | Winner | Score | To par | Margin of
victory | Runner(s)-up | Ref. |
|---|
| ACN Championship |
| 2025 | JPN |  Yuta Suigura | 200 | −13 | 3 strokes | Shu Fukuzumi
Shugo Imahira
Naoyuki Kataoka
Takashi Ogiso
Tatsunori Shogenji | |
| 2024 | JPN | Takumi Kanaya | 264 | −20 | Playoff |  Ryu Hyun-woo | |
| 2023 | JPN | Yuki Inamori | 271 | −17 | Playoff | Song Young-han | |
| Asia Pacific Open Golf Championship Diamond Cup |
| 2022 | ASA, JPN | Shugo Imahira | 272 | −8 | 1 stroke | Hiroshi Iwata
Yuto Katsuragawa
Kaito Onishi
Kosuke Suzuki (a) | |
| Asia-Pacific Diamond Cup Golf |
| 2021 | JPN | Rikuya Hoshino | 275 | −13 | 4 strokes |  Juvic Pagunsan | |
| 2020 | ASA, JPN |
Cancelled due to the COVID-19 pandemic | |
| 2019 | ASA, JPN | Yosuke Asaji | 281 | −3 | 1 stroke |  Micah Lauren Shin
Ren Yonezawa (a) |
|
| 2018 | ASA, JPN | Yuta Ikeda | 269 | −15 | 6 strokes |  Justin Harding |
|
| 2017 | ASA, JPN | Daisuke Kataoka | 272 | −12 | 2 strokes |  Poom Saksansin
Tadahiro Takayama |
|
| 2016 | ASA, JPN |  Chan Shih-chang | 270 | −10 | 2 strokes | Ippei Koike |
|
| 2015 | ASA, JPN | Kim Kyung-tae (2) | 271 | −9 | 3 strokes | Yuta Ikeda
Toshinori Muto |
|
| 2014 | ASA, JPN | Hiroyuki Fujita | 278 | −6 | 2 strokes | Kiradech Aphibarnrat
Hur Suk-ho
Jason Knutzon |
|
| Diamond Cup Golf |
| 2013 | JPN | Hideki Matsuyama | 279 | −9 | 2 strokes |  Brad Kennedy
Kim Hyung-sung
Park Sung-joon |
|
| 2012 | JPN | Hiroyuki Fujita | 274 | −14 | 3 strokes | Kiradech Aphibarnrat |
|
| 2011 | JPN | Koumei Oda | 272 | −16 | 4 strokes | Toshinori Muto
Kaname Yokoo |
|
| 2010 | JPN | Kim Kyung-tae | 272 | −16 | 2 strokes | Koumei Oda |
|
| Mitsubishi Diamond Cup Golf |
| 2009 | JPN | Takashi Kanemoto | 283 | −5 | Playoff | Brendan Jones |
|
| 2008 | JPN | Prayad Marksaeng | 274 | −10 | 1 stroke | Shintaro Kai |
|
| 2007 | JPN | Tetsuji Hiratsuka (2) | 282 | −2 | 1 stroke | Satoru Hirota
Kiyoshi Miyazato |
|
| 2006 | JPN | Kaname Yokoo | 275 | −9 | 2 strokes | Nozomi Kawahara
Toru Suzuki |
|
| 2005 | JPN | Jang Ik-jae | 275 | −5 | 3 strokes | Shingo Katayama
Ryoken Kawagishi |
|
| 2004 | JPN | Tetsuji Hiratsuka | 275 | −13 | 5 strokes | Hidemasa Hoshino |
|
| Diamond Cup Tournament |
| 2003 | JPN | Todd Hamilton | 276 | −12 | 3 strokes | Steven Conran |
|
| 2002 | JPN | Tsuneyuki Nakajima (4) | 269 | −19 | 2 strokes | Tomohiro Kondo
Hirofumi Miyase
Christian Peña |
|
| 2001 | JPN | Toshimitsu Izawa | 277 | −11 | Playoff | Hiroyuki Fujita
Yuji Igarashi |
|
| Mitsubishi Motors Tournament |
| 2000 | JPN | Hirofumi Miyase | 276 | −8 | Playoff | Toru Taniguchi |
|
| 1999 | JPN |  Tsuyoshi Yoneyama | 268 | −16 | Playoff | Kazuhiko Hosokawa |
|
| Mitsubishi Galant Tournament |
| 1998 | JPN | Toru Taniguchi | 268 | −16 | 1 stroke | Kazuhiko Hosokawa |
|
| 1997 | JPN | Masashi Ozaki (2) | 278 | −10 | 2 strokes | Satoshi Higashi
Kōki Idoki
Tōru Nakamura |
|
| 1996 | JPN | Masashi Ozaki | 279 | −9 | Playoff | Todd Hamilton |
|
| 1995 | JPN | Brandt Jobe | 266 | −26 | 6 strokes | Masahiro Kuramoto |
|
| 1994 | JPN | Katsuyoshi Tomori | 205 | −11 | 6 strokes | Tsuneyuki Nakajima |
|
| 1993 | JPN | Chen Tze-chung | 277 | −11 | 4 strokes | Brian Jones
Yoshi Mizumaki
Tateo Ozaki |
|
| 1992 | JPN | Isao Aoki (2) | 277 | −11 | 4 strokes | Chen Tze-chung
Saburo Fujiki |
|
| 1991 | JPN | Koichi Suzuki | 280 | −8 | 1 stroke | Isao Aoki
Tsuneyuki Nakajima |
|
| 1990 | JPN | Isao Aoki | 289 | +1 | 3 strokes | Masashi Ozaki
Teruo Sugihara
Tsuyoshi Yoneyama |
|
| 1989 | JPN | Tateo Ozaki | 284 | −4 | 2 strokes | Masanobu Kimura |
|
| 1988 | JPN | Brian Jones (3) | 271 | −17 | Playoff | Naomichi Ozaki |
|
| 1987 | JPN | Brian Jones (2) | 283 | −5 | 3 strokes | Nobuo Serizawa
Koichi Suzuki |
|
| 1986 | JPN | Tsuneyuki Nakajima (3) | 280 | −8 | 1 stroke | Chen Tze-ming |
|
| 1985 | JPN | Brian Jones | 272 | −12 | Playoff | Nobumitsu Yuhara |
|
| 1984 | JPN | Haruo Yasuda (2) | 275 | −13 | 4 strokes | Kouichi Inoue
Yoshitaka Yamamoto |
|
| 1983 | JPN | Tsuneyuki Nakajima (2) | 278 | −10 | 6 strokes | Lu Hsi-chuen |
|
| 1982 | JPN | Graham Marsh (3) | 271 | −13 | Playoff | Teruo Sugihara |
|
| 1981 | JPN | Lu Hsi-chuen | 289 | +1 | Playoff | Tōru Nakamura
Teruo Sugihara |
|
| 1980 | JPN | Tsuneyuki Nakajima | 276 | −12 | 4 strokes | Yoshihisa Iwashita
Graham Marsh |
|
| 1979 | JPN | Tōru Nakamura (2) | 285 | −3 | 1 stroke | Yoshio Kusayanagi |
|
| 1978 | JPN | Tōru Nakamura | 280 | −8 | 1 stroke | Hsu Sheng-san
Norio Suzuki |
|
| 1977 | JPN | Hsu Sheng-san | 277 | −11 | 3 strokes | Takaaki Kono
Graham Marsh
Teruo Sugihara |
|
| Dunlop Tournament |
| 1976 | JPN | Yoshikazu Yokoshima | 274 | −14 | 2 strokes | Isao Aoki |
|
| 1975 | JPN | Norio Suzuki | 278 | −10 | 2 strokes |  Mya Aye |
|
| 1974 | JPN | Graham Marsh (2) | 272 | −16 | 3 strokes | Masashi Ozaki
Teruo Sugihara |
|
| 1973 | JPN |  Ben Arda | 280 | −8 | 4 strokes | Masashi Ozaki |
|
| 1972 | | Graham Marsh | 271 | −17 | 5 strokes | Ben Arda |
|
| 1971 | | Peter Thomson | 280 | −8 | 1 stroke | Haruo Yasuda |
|
| 1970 | | Haruo Yasuda | 137 | −7 | 2 strokes | Fujio Ishii
Takashi Murakami |
|
| 1969 | | Takaaki Kono | | | | |
|
