Argentines elected 53-year-old political outsider Javier Milei as their new president on Sunday.

Milei, an economist and self-described libertarian, pulled in nearly 56% of all votes counted in his runoff against left-wing rival opponent, Sergio Massa, completing one of the most unlikely presidential victories in modern history.

Milei first stunned the world in August when he managed to pull in 30% of the vote in Argentina's presidential primary, far above what political prognosticators had anticipated.