Ramba uchinyora ndima iyi - Makwikwi ake okutanga akauya muna 2006, paakava wechipiri pakumhanya hafu yemarathoni muMazatlán uye akawana nguva ya1: 16:48 uye 2: 51:32 paMexico City Marathon. Akavandudza nguva yake yakanakisisa yemarathon ye2: 43: maawa 21 gore rakatevera uye akakunda menduru yesirivha mu5000 m pa2007 NACAC Championships muSan Salvador. Romero akaita kutanga kwake padanho repasi rose pa2009 IAAF World Half Marathon Championships
uye akapedza ari panzvimbo yechi39. Gore rakatevera iye akamhanya marathon yakanakisisa ye2: 42: 33 maawa muLeón, Mexico asati aenda kunotora menduru yegoridhe yevakadzi mumutambo uyu pa2010 Central American neCaribbean Games. Akamhanya hafu yemarathon yakanakisisa ye1:14: 13 maawa pa2010 IAAF World Half Marathon Championships muNanning kuti apedze munzvimbo ye22 mumakwikwi evakadzi.