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    vs.      
Naoaki Umesaki is tied in the series against David A Williams, 1-1.

event round table player one result player two
2009 World Championship5178Umesaki, Naoaki (1598)Lost 0-2Williams, David A (1752)
2009 World Championship1371Umesaki, Naoaki (1685)Won 2-0Williams, David A (1808)