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    vs.      
Hayato Ishii is tied in the series against Kazuya Hirabayashi, 1-1.

event round table player one result player two
Grand Prix Sendai 2004571Ishii, Hayato (1601)Lost 1-2Hirabayashi, Kazuya (1768)
Grand Prix Niigata 2009260Ishii, Hayato (1702)Won 2-0Hirabayashi, Kazuya (1687)