In mid-2013, Češka teamed up with Canada's Cortney Mansour to compete for the Czech Republic, following a tryout in Europe. They were coached by Carol Lane, John Lane, and Juris Razgulajevs in Toronto, Ontario, Canada. Making their international debut, Mansour/Češka placed 12th at a Junior Grand Prix (JGP) event in Gdańsk in September 2013 and tenth the following month at JGP Ostrava in the Czech Republic. The duo finished 13th at the 2014 World Junior Championships in Sofia, Bulgaria, after placing 14th in both segments.