Gripped by its worst economic crisis in decades, Argentina is facing an unusual choice in Sunday's election: elect Economy Minister Sergio Massa, who has overseen triple-digit inflation and rising poverty, or choose libertarian outsider Javier Milei who wants to ditch both the central bank and the national currency -- using the US dollar instead.

The dire state of the economy is the main concern of voters weary of repeated fiscal crises, inflation and currency controls.

Without proof, or any complaints filed, claims of electoral fraud have been shared tens, sometimes hundreds of thousands of times on social media accounts backing Argentina's ultra-libertarian presidential candidate Javier Milei.

In Argentina, where women have made some recent gains but are still fighting for full equal rights, anti-establishment presidential candidate Javier Milei has divided the electorate with an unashamedly machismo stance.

The current government's Economy Minister saw a large jump in support compared to August's primaries. Opposition leader Patricia Bullrich came in third

Some 200 people have been arrested for "piranha attacks" —from the outskirts of Buenos Aires to the Patagonian city of Bariloche and the Mendoza wine region.

Votes were still being counted late Sunday, but analysts agreed that Javier Milei is a real contender for the presidency in Argentina.