For the first time since World War II, a right-wing politician could win Sunday's election for the Austrian presidency as established parties that have dominated postwar politics watch from the sidelines.

Candidates backed by the dominant Social Democratic and centrist People's Party were eliminated in last month's first round, which means neither will become president for the first time since the end of the war.

That reflects deep disillusionment with the political status quo and their approach to the migrant crisis and other issues.

As voting got underway Sunday, the contest was too close to call between Norbert Hofer of the right-wing Eurosceptic Freedom Party and Greens Party politician Alexander Van der Bellen, who is running as an independent.