Mr. Wickremesinghe, 75, a six-time former prime minister, is a political survivor. His elevation to the presidency in 2022, after the overthrow of Gotabaya Rajapaksa, plucked him out of irrelevance and demonstrated his formidable bargaining powers.

Wickremensignhe’s main challengers — opposition leader Sajith Premadasa and parliamentarian Anura Dissanayake, a surprise top contender who heads a new leftist coalition — have promised major political changes, including renegotiating a deal with the International Monetary Fund to win more favorable terms.

Voting ends in Sri Lanka's presidential election as it seeks to recover from economic crisis and political upheaval