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

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