About 34 million Argentines will head to the polls on Sunday in an election widely expected to cement the end of President Mauricio Macri's term.
Argentina has imposed currency controls in an attempt to stabilise markets as the country faces a deepening financial crisis.
"Argentina is a small economy. However, the last thing global markets want to see is another market-friendly government fall to populism and/or geopolitics,” said Rabobank strategist Michael Every.
Argentina’s international bonds tumbled in London trading after a populist opposition candidate routed President Mauricio Macri in a shock primary election result.
Argentina captain Lionel Messi has been banned from international football for three months after claiming the Copa America was "corrupt".
US Secretary of State announces targeted sanctions against Hezbollah operative Salman Raouf Salman, who allegedly “served as the on the ground coordinator for the AMIA bombing,” during visit to Buenos Aires for terrorism conference.
Lionel Messi claimed Argentina were treated unfairly at the Copa America and did not collect his bronze medal after being controversially sent off in the 2-1 third-place play-off win over Chile.
Brazil 2-0 Argentina: Gabriel Jesus and Roberto Firmino struck as the hosts advanced to the final at the expense of their bitter rivals