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    vs.      
Riku Kumagai is tied in the series against Tadayuki Terai, 1-1.

event round table player one result player two
Grand Prix Chiba 201814634Kumagai, Riku (1995)Lost 1-2Terai, Tadayuki (1820)
Grand Prix Taipei 2019613Kumagai, Riku (2151)Won 2-1Terai, Tadayuki (1854)