| event | round | table | player one | result | player two |
| Grand Prix Nagoya 2019 | 14 | 10 | Kosaka, Kazune (1871) | Lost 1-2 | Kumagai, Riku (2126) |
| Regional Championships Aichi 2022 | 3 | 8 | Kosaka, Kazune (1922) | Lost 0-2 | Kumagai, Riku (2101) |
| Pro Tour Phyrexia | 10 | 55 | Kosaka, Kazune (1906) | Won 2-1 | Kumagai, Riku (2103) |