| Gateway to The Open Mizuno Open | |
| Location: | Kasaoka, Okayama, Japan |
| Establishment: | 1971 |
| Course: | JFE Setonaikai Golf Club |
| Par: | 72 |
| Tour: | Japan Golf Tour |
| Format: | Stroke play |
| Month Played: | May |
| Aggregate: | 266 Norio Suzuki (1980) |
| To-Par: | −20 as above |
| Current Champion: |  Ryosuke Kinoshita |
| Map: | Japan#Japan Okayama Prefecture |
| Map Label: | Setonaikai Golf Club |
| Map Relief: | yes |
| Map Size: | 200 |
| Coordinates: | 34.479°N 133.47°W |
The is a professional golf tournament played in Japan. Founded in 1971, it has been a Japan Golf Tour event since 1979. Since 1998, the event has been prefixed, with the top finishers gaining exemptions into The Open Championship.
The Mizuno Open has been held at several courses, most recently at Setonaikai Golf Club in Kasaoka, Okayama in 2021.
The purse for the 2021 event was ¥80,000,000, with ¥16,000,000 going to the winner.
The Mizuno Open was founded in 1971 as the Mizuno Tournament with both men's and women's events running side-by-side. It was restricted to golfers using at least ten Mizuno clubs. In 1979, fifty leading professionals in Japan were also eligible to compete as the tournament counted towards the Japan Golf Tour money-list ranking for the first time. In 1983 it became a full tour event and in 1985 changed its name to the Mizuno Open. From 1991, the women's event was played separately.
Since 1998, the event has been prefixed "Gateway to The Open", with the top four finishers in the tournament that were not already qualified gaining exemptions into The Open Championship. There has also been a mini-money list of Japan Golf Tour events up to and including the Mizuno Open that earns two exemptions into The Open. From 2007 to 2010 The Mizuno Open merged with the Yomiuri Open to form the Gateway to The Open Mizuno Open Yomiuri Classic.
| Years | Venue | Location | |
|---|---|---|---|
| 1998–2006, 2011–2017, 2021 | Setonaikai Golf Club | Kasaoka, Okayama | |
| 2018–2019 | The Royal Golf Club | Hokota, Ibaraki | |
| 2007–2010 | Yomiuri Country Club | Nishinomiya, Hyōgo | |
| 1976–1997 | Tokinodai Country Club | Hakui, Ishikawa | |
| 1971–1975 | Anegasaki Country Club | Ichihara, Chiba |
| Year | Winner | Score | To Par | Margin of victory | Runner(s)-up | ||
|---|---|---|---|---|---|---|---|
| Gateway to The Open Mizuno Open | |||||||
| 276 | −12 | 2 strokes | [1] | ||||
| 271 | −17 | Playoff | [2] | ||||
| 276 | −12 | Playoff | [3] | ||||
| 199 | −17 | 3 strokes | [4] | ||||
| align=center colspan=5 | Cancelled due to the COVID-19 pandemic | ||||||
| 281 | −7 | 1 stroke |  Chan Kim | [5] | |||
| 287 | −1 | 1 stroke |  Michael Hendry Masahiro Kawamura Masanori Kobayashi | [6] | |||
| 273 | −15 | 5 strokes | Michael Hendry | [7] | |||
| 277 | −11 | 1 stroke | Kodai Ichihara Shugo Imahira Lee Sang-hee | [8] | |||
| 273 | −15 | 2 strokes |  Scott Strange | [9] | |||
| 273 | −15 | 3 strokes |  Juvic Pagunsan | [10] | |||
| Brendan Jones (2) | 269 | −19 | 3 strokes | Kim Kyung-tae | [11] | ||
| 271 | −17 | 3 strokes | Toshinori Muto Toru Taniguchi | [12] | |||
| 275 | −13 | 1 stroke | Kim Kyung-tae | [13] | |||
| Gateway to The Open Mizuno Open Yomiuri Classic | |||||||
| 201 | −15 | 3 strokes | Toru Taniguchi | [14] | |||
| 275 | −13 | 3 strokes | David Smail | [15] | |||
| 269 | −15 | 1 stroke | Azuma Yano | [16] | |||
| Lee Dong-hwan | 204 | −12 | 4 strokes | Lee Seong-ho Lin Keng-chi Toshinori Muto Achi Sato Hideto Tanihara Masaya Tomida | |||
| Gateway to The Open Mizuno Open | |||||||
| 274 | −14 | 3 strokes | Tatsuhiko Ichihara David Smail | ||||
| 278 | −10 | Playoff | David Smail Tadahiro Takayama | ||||
| 274 | −14 | Playoff | Hiroaki Iijima | ||||
| 278 | −10 | 1 stroke | Brendan Jones | ||||
| 277 | −11 | 1 stroke | Kiyoshi Miyazato | ||||
| 272 | −16 | 3 strokes |  Eduardo Herrera | ||||
| 274 | −14 | 1 stroke | Toshimitsu Izawa Katsumasa Miyamoto | ||||
| 274 | −14 | 2 strokes | Tsukasa Watanabe | ||||
| 275 | −13 | 4 strokes | Yoshi Mizumaki Toru Suzuki | ||||
| Mizuno Open | |||||||
| Brian Watts (3) | 278 | −10 | 2 strokes | Toshimitsu Izawa | |||
| 270 | −18 | 4 strokes | Shinichi Yokota | ||||
| Brian Watts (2) | 273 | −15 | 3 strokes |  Rick Gibson | |||
| 280 | −8 | Playoff | Eduardo Herrera Yoshinori Kaneko Koichi Suzuki | ||||
| 280 | −8 | 1 stroke | Wayne Grady Tateo Ozaki Teruo Sugihara | ||||
| 282 | −6 | 1 stroke | Saburo Fujiki Brian Jones | ||||
| 207 | −9 | Playoff | Satoshi Higashi | ||||
| 272 | −16 | 4 strokes | Tsuneyuki Nakajima | ||||
| 283 | −5 | 2 strokes | Brian Jones Fujio Kobayashi Masahiro Kuramoto Tsuneyuki Nakajima | ||||
| 280 | −8 | Playoff | Seiichi Kanai | ||||
| 272 | −16 | 8 strokes | Chen Tze-ming Tōru Nakamura | ||||
| 239 | −11 | 6 strokes | Tsukasa Watanabe | ||||
| 205 | −11 | Title shared | |||||
| Mizuno Tournament | |||||||
| Kikuo Arai (2) | 279 | −9 | 1 stroke | Naomichi Ozaki | [17] | ||
| 277 | −11 | 3 strokes | Hsieh Min-Nan Tsuneyuki Nakajima Shigeru Uchida | ||||
| 282 | −6 | ||||||
| 274 | −12 | 2 strokes | Shigeru Uchida | [18] | |||
| 266 | −20 | 6 strokes | Yoshikazu Yokoshima | [19] | |||
| 272 | −16 | 2 strokes | Teruo Sugihara Ichiro Teramoto | ||||
| 1978 | 276 | −12 | 1 stroke | Shigeru Uchida | |||
| 1977 | Masaji Kusakabe (2) | 283 | −5 | Playoff | Shigeru Uchida | ||
| 1976 | 215 | −6 | 2 strokes | Han Chang-sang Shigeru Uchida Takemitsu Uranishi Yuki Watanabe | |||
| 1975 | Shigeru Uchida (2) | 215 | −1 | 3 strokes | Takashi Aoki | ||
| 1974 | 210 | −6 | 1 stroke | Shichiro Enomoto | |||
| 1973 | 208 | −8 | 3 strokes | Akio Kanemoto | |||
| 1972 | |||||||
| 1971 | 214 | −2 | 2 strokes | Shichiro Enomoto | |||