Opinion polls are showing an increasingly tight race between Peronist economy minister Sergio Massa and radical libertarian Javier Milei ahead of a runoff ballot for president on 19 November. The two candidates offer polarised visions for the embattled Latin American country, the region's third largest economy, a major supplier of grains, beef and lithium, but also the largest debtor to the International Monetary Fund (IMF). One recent survey showed Massa ahead with 42.4% of the likely vote against Milei on 39.7%, his lead more than cut in half versus the previous poll in late October. He is still seen as the candidate to beat, but Milei has gained ground, winning the backing of conservative Patricia Bullrich, who finished third in the first-round vote, and her powerful ally, former President Mauricio Macri. Significantly, with some 18% of those polled remaining unsure, the outcome is hard to call.