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    vs.      
Yuji Koyama leads the series against Masahiro Kumagai, 2-0.

event round table player one result player two
Grand Prix Kobe 20152479Koyama, Yuji (1700)Won 2-0Kumagai, Masahiro (1518)
Grand Prix Tokyo 201615138Koyama, Yuji (1764)Won 2-0Kumagai, Masahiro (1627)