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    vs.      
Junya Iyanaga leads the series against Kazuya Hirabayashi, 3-1.

event round table player one result player two
Grand Prix Yokohama 2004730Iyanaga, Junya (1561)Won 2-1Hirabayashi, Kazuya (1976)
Grand Prix Kitakyushu 2007917Iyanaga, Junya (1933)Lost 0-2Hirabayashi, Kazuya (1809)
Grand Prix Kitakyushu 2007QIyanaga, Junya (1944)Won 2-0Hirabayashi, Kazuya (1890)
Grand Prix Yokohama 2010716Iyanaga, Junya (1880)Won 2-0Hirabayashi, Kazuya (1889)