HEERENVEEN, Netherlands, March 6 - Jenning de Boo and Femke Kok claimed the men's and women's sprint crowns on day two of the ISU Speed Skating World Championships on Friday, reinforcing Dutch dominance in Heerenveen.

De Boo, who delivered blistering performances to win the opening 500 meters and 1,000m on Thursday, returned to the ice for a highly anticipated showdown with American sensation Jordan Stolz in the 13th and final pair of the second 500m.