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

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