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    vs.      
Kenta Koyama leads the series against Yuusuke Ookawa, 2-0.

event round table player one result player two
Grand Prix Kyoto 2007555Koyama, Kenta (1610)Won 2-0Ookawa, Yuusuke (1536)
Grand Prix Shizuoka 2008524Koyama, Kenta (1766)Won 2-0Ookawa, Yuusuke (1591)