Mezue ahịrịokwu na-esonụ: A mụrụ Prieto na Segovia, ma mee ka mba ya pụta na 1983 European Athletics Junior Championships, na-etinye nke ise na 10,000 m na-eje ije. Ọ bịara nke asaa n'ọsọ ije ije 20 km na 1985 IAAF World Race Walking Cup wee gaa n'ihu merie ọla nchara na ihe omume ahụ na 1986 European Athletics Championships. O guzobere onwe ya dị ka otu n'ime ndị na-agagharị agagharị na Spain, na-asọ mpi na World Championships na Athletics na 1987 na 1991. Prieto meriri nrite mba ụwa nke abụọ ya na 1989 Summer Universiade, ebe ọ bụ onye nrite ọla ọcha na 20 km na-aga n'azụ Walter Arena nke Italy. Ọ bịara nke iri na atọ na
1990 European Athletics Championships ma mechie otu ebe dị ala karịa nke ahụ na 1991 IAAF World Race Walking Cup.