Ecuadorans will choose between returning to socialism or preserving the conservative status quo in a presidential runoff set for October after Sunday's first round produced a left-right clash rather than an outright winner.
Luisa Gonzalez, a lawyer close to divisive former socialist president Rafael Correa, emerged as the front-runner with 33% of the first-round votes.
She will go head-to-head with surprise second-place candidate Daniel Noboa, the youthful son of one of Ecuador's richest men, who netted 24% of the votes.