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    vs.      
Kouhei Watanabe leads the series against Naoki Yamamura, 2-0.

event round table player one result player two
Grand Prix Nagoya 20163885Watanabe, Kouhei (1446)Won 2-0Yamamura, Naoki (1501)
Grand Prix Shizuoka 201713185Watanabe, Kouhei (1558)Won 2-0Yamamura, Naoki (1645)