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The 59th Oza is one of the main Go tournaments in 2011. It began on 13 January 2011. The winner of the challenger tournament faced the title-holder Cho U. [1]
| Round of 16 | Quarter-finals | Semi-finals | Final | |||||||||||
| 28 April | ||||||||||||||
| Hane Naoki | 1 | |||||||||||||
| 30 May | ||||||||||||||
| Kobayashi Satoru | 0 | |||||||||||||
| Hane Naoki | 1 | |||||||||||||
| 19 May | ||||||||||||||
| Cho Chikun | 0 | |||||||||||||
| Yoda Norimoto | 0 | |||||||||||||
| 20 June | ||||||||||||||
| Cho Chikun | 1 | |||||||||||||
| Hane Naoki | 1 | |||||||||||||
| 12 May | ||||||||||||||
| Mitani Tetsuya | 0 | |||||||||||||
| So Yokoku | 0 | |||||||||||||
| 9 June | ||||||||||||||
| Murakawa Daisuke | 1 | |||||||||||||
| Murakawa Daisuke | 0 | |||||||||||||
| 14 April | ||||||||||||||
| Mitani Tetsuya | 1 | |||||||||||||
| Mitani Tetsuya | 1 | |||||||||||||
| 8 September | ||||||||||||||
| Mochizuki Kenichi | 0 | |||||||||||||
| Hane Naoki | 1 | |||||||||||||
| 14 April | ||||||||||||||
| Iyama Yuta | 0 | |||||||||||||
| Iyama Yuta | 1 | |||||||||||||
| 9 June | ||||||||||||||
| Imamura Toshiya | 0 | |||||||||||||
| Iyama Yuta | 1 | |||||||||||||
| 12 May | ||||||||||||||
| Nakano Yasuhiro | 0 | |||||||||||||
| Matsumoto Takehisa | 0 | |||||||||||||
| 14 July | ||||||||||||||
| Nakano Yasuhiro | 1 | |||||||||||||
| Iyama Yuta | 1 | |||||||||||||
| 21 April | ||||||||||||||
| Yamada Kimio | 0 | |||||||||||||
| Yamashiro Hiroshi | 0 | |||||||||||||
| 19 May | ||||||||||||||
| Yamashita Keigo | 1 | |||||||||||||
| Yamashita Keigo | 0 | |||||||||||||
| 21 April | ||||||||||||||
| Yamada Kimio | 1 | |||||||||||||
| Yamada Kimio | 1 | |||||||||||||
| Kono Rin | 0 | |||||||||||||
| Cho U (Oza) | 1 | 1 | 1 | - | - | |
| Hane Naoki Challenger | 0 | 0 | 0 | - | - | |
| Win by | 3.5 | 1.5 | Resignation | - | - | |
| Location | Tokyo | Hyogo | Yamagata | (Kanagawa) | (Shizuoka) |
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