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    vs.      
Riku Kumagai leads the series against Yuya Sugiyama, 2-0.

event round table player one result player two
Grand Prix Yokohama 2013623Kumagai, Riku (1706)Won 2-1Sugiyama, Yuya (1853)
Grand Prix Singapore 2018941Kumagai, Riku (1937)Won 2-0Sugiyama, Yuya (1951)