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    vs.      
Kenta Koyama leads the series against Yuuichi Yamaguchi, 2-0.

event round table player one result player two
Grand Prix Nagoya 20045185Koyama, Kenta (1484)Won 2-0Yamaguchi, Yuuichi (1468)
Grand Prix Okayama 20085109Koyama, Kenta (1714)Won 2-1Yamaguchi, Yuuichi (1662)