Tusi se faʻaauau mo lenei palakalafa - Na fanau Prieto i Segovia, ma na faia lana amataga faʻavaomalo i le 1983 European Athletics Junior Championships, faʻatulagaina lona lima i le 10,000 mita savali. Na sau lona fitu i le 20 km race walk i le 1985 IAAF World Race Walking Cup ona alu ai lea e manumalo i se pine apamemea i le mea na tupu i le 1986 European Athletics Championships. Na avea o ia ma se tasi o tagata savavali taʻutaʻua a Sepania, na tauva i le Ipu a le Lalolagi i Taʻaloga i le Taʻaloga i le 1987 ma le 1991. Na manumalo Prieto i lana pine faavaomalo lona lua i le 1989 Summer Universiade, lea na ia manumalo ai i le pine siliva i le 20 km savali i tua o le Walter Arena a Italia. Na sau lona 13 i le 1990 European Athletics Championships
ma na iʻu ai i se tulaga e tasi e itiiti ifo i lo lenā i le 1991 IAAF World Race Walking Cup.