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

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