Socialist candidate Lenin Moreno had a slim lead over conservative ex-banker Guillermo Lasso in Ecuador's runoff presidential vote Sunday, according to partial results, setting up a tense wait for the final count.

Moreno, the designated heir to a decade of President Rafael Correa's "21st-century socialism," had 51.07 percent of the vote to 48.93 percent for Lasso, with 94.2 percent of districts reporting, said the National Electoral Council.