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    vs.      
Hayato Ishii is tied in the series against Shiou Obata, 1-1.

event round table player one result player two
Grand Prix Yokohama 20103347Ishii, Hayato (1776)Won 2-0Obata, Shiou (1389)
Grand Prix Sendai 2010630Ishii, Hayato (1794)Lost 0-2Obata, Shiou (1387)