The Latest: Opposition hopes make stand in Istanbul, Ankara

The Latest on Turkey's municipal elections (all times local):

9:35 p.m.

Voters in Turkey are electing mayors for 30 large cities, and a main battleground for President Recep Tayyip Erdogan's party appears to be in the capital, Ankara.

Opinion polls suggested the candidate of an opposition alliance, Mansur Yavas, could end the longtime rule of Erdogan's Justice and Development Party in Ankara. A former government environment minister, Mehmet Ozhaseki, is running for mayor under the banner of Erdogan and his nationalist allies.

Another closely watched mayoral election is in Istanbul. Erdogan began his rise to power as the city's mayor in 1994 and has said at campaign rallies that "whoever wins Istanbul, wins Turkey."

Erdogan named former Prime Minister Binali Yildirim to run against opposition candidate Ekrem Imamoglu in the Istanbul mayor's race. The president spoke at six rallies in Istanbul on Saturday.

Erdogan has campaigned tirelessly for Justice and Development Party candidates and framed the municipal elections taking place across Turkey on Sunday as matters of "national survival."

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7:10 a.m.

Voters in Turkey have begun casting ballots in municipal elections that are seen as a barometer of President Recep Tayyip Erdogan's popularity amid a sharp economic downturn in the nation that straddles Europe and Asia.

More than 57 million voters are eligible to choose mayors, local representatives and neighborhood or village administrators. The elections are being held as Turkey faces an economic recession, rising food prices and high unemployment.

Erdogan's past electoral successes have been based on economic prosperity, but opinion polls suggest this time around his ruling party could lose control of Turkey's large cities, including Ankara, the capital.

Erdogan has campaigned heavily for his party's candidates, declaring Turkey's economic woes "an attack" on the country and framing the elections on Sunday as matter of "national survival."