PORT-AU-PRINCE, Haiti — Many of the ballots arrived late and some voters were turned away, but the problems appeared minimal in a presidential runoff Sunday to decide whether a bawdy Carnival singer running as a populist or a former first lady rooted in the establishment will lead this country for the next five years.

It was a far cry from the first round of voting in November, when chaos and confusion reigned and frustrated voters choosing among 19 candidates trashed polling stations, adding to a long history of political strife here.

This time, by midday, most of the snags in delivering voting materials appeared resolved and, despite reports of sporadic problems and violence in other parts of the country, voting proceeded in an orderly manner across the capital, with officials extending the balloting here by an hour in response to the morning delays.

The turnout was unclear, however. Some stations had long lines, but others, after an initial crowd, had thinned out to a steady stream or even a trickle. And the counting of the ballots, another opportunity for the kind of fraud and disarray that undermined the first round of voting, was still to come.