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    vs.      
Mamoru Nagai is tied in the series against Keisuke Oshima, 1-1.

event round table player one result player two
Grand Prix Shizuoka 20178135Nagai, Mamoru (1705)Lost 0-2Oshima, Keisuke (1514)
Grand Prix Nagoya 2019516Nagai, Mamoru (1896)Won 2-0Oshima, Keisuke (1751)