De Leeuw meriri ọlaedo na 1974 European Championships
na Geneva. Na 1976 Winter Olympics na Innsbruck, ọ na-ebu ọkọlọtọ Dutch ma na-eme njem kwa ụbọchị na Germany maka oge ice. O nwetara ihe nrite ọlaọcha, ebe Hamill na Errath nwetara ọla edo na ọla nchara n'otu n'otu. Mgbe o nwetasịrị ọla nchara na 1976 World Championships na Gothenburg, de Leeuw lara ezumike nká na asọmpi ISU. Ọ gara njem na ezumike na Ice na Ice Follies wee bụrụ onye nkuzi, na-arụ ọrụ na Westminster Ice Palace na Westminster, California na Anaheim Ice.