A poor showing for Argentina's President Mauricio Macri and a surge for his leftist opponent sparked fears of a possible default on the country's IMF loans, sending the peso to its lowest level in nearly two decades and causing a massive sell-off in the country's stock market.
Although Macri, who belongs to the center-right Republican Proposal party, was not expected to do well in Monday's primary, populist Alberto Fernández and his running mate, ex-president Christina Kirchner, scored 15 points higher in their primary for Citizen's Unity.