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    vs.      
Hiroki Yamagata leads the series against Riku Kumagai, 2-0.

event round table player one result player two
Regional Championships Yokohama 2023161Yamagata, Hiroki (1501)Won 2-0Kumagai, Riku (1994)
Regional Championships Aichi 20231119Yamagata, Hiroki (1503)Won 2-0Kumagai, Riku (1905)