The campaign to lead the World Trade Organization during the most turbulent period of its 25-year existence has officially begun. Playing out against the backdrop of a pandemic, a worldwide recession, the U.S.-China battle for trade supremacy and the American presidential election, there couldn’t be more at stake. But Brazilian Director-General Roberto Azevedo’s decision to step down at the end of August, a year before his term ends, also offers an opportunity for the U.S., European Union and ot