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    vs.      
Nathan Colker is tied in the series against Jack Kiefer, 1-1.

event round table player one result player two
Grand Prix San Jose 201715132Colker, Nathan (1782)Lost 0-2Kiefer, Jack (1916)
Grand Prix Las Vegas 2018 (limited)105111Colker, Nathan (1984)Won 2-1Kiefer, Jack (1970)