Greeks are heading to the polls to elect a new parliament, in a snap vote that all opinion polls predict will put an end to more than four years of leftist rule.
After a largely lacklustre campaign dominated by disappointment over the pace of the country's economic recovery, polling stations on Sunday opened across Greece at 7am (04:00 GMT). They will close 12 hours later, when initial exit polls will be published.
Prime Minister Alexis Tsipras, 44, called the election three months before the end of his term after his left-wing Syriza suffered a crushing 9.5-percentage point defeat in May's European Parliament elections.
Waiting in the wings to replace Syriza is the centre-right New Democracy party, led by Kyriakos Mitsotakis, the 51-year-old son of a former prime minister and brother of an former foreign minister.
He is seeking an absolute majority in the country's 300-member parliament, a result that will mark a major shift for the crisis-hit country run for nearly a decade by fragile coalitions of ideologically divergent parties united by their stance either in favour or against Greece's bailout deals.
Public surveys in the lead-up to Sunday's vote showed New Democracy retaining a firm 8-10 percentage-point lead over Syriza, as well as being able to secure an outright majority.
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