Wall Street strategists who recommended loading up on Brazil assets after Flávio Bolsonaro emerged as the frontrunner for president are about to see if they led clients astray or to profits ahead of Sunday’s too-close-to-call runoff.

Brazilian assets surged on expectations that Flávio Bolsonaro will address the country’s mounting fiscal problems and pave the way for interest-rate cuts after he became the surprise favorite to win the presidency in an Oct. 25 runoff against Luiz Inácio Lula da Silva.

The worst trading outage ever in Brazilian financial markets was just the latest disruption over the past year to bedevil investors in Latin America’s biggest economy.