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    vs.      
Joao Isidro leads the series against Konstantin Firsov, 2-0.

event round table player one result player two
1999 World Championship1748Isidro, Joao (1531)Won 0-0Firsov, Konstantin (1508)
Grand Prix Madrid 2000410Isidro, Joao (1585)Won 2-1Firsov, Konstantin (1474)