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    vs.      
Hiroki Yamashita leads the series against Shinichi Kumagai, 2-0.

event round table player one result player two
Grand Prix Shizuoka 20036167Yamashita, Hiroki (1449)Won 2-0Kumagai, Shinichi (1607)
Grand Prix Niigata 2005786Yamashita, Hiroki (1536)Won 2-1Kumagai, Shinichi (1625)