In a much closer first round of presidential voting than expected, Buenos Aires Mayor Mauricio Macri did well enough to force a Nov. 22 runoff with first-place finisher Daniel Scioli, the candidate of Argentina's ruling party.
With nearly all votes counted, Scioli, who is governor of Buenos Aires state and a former vice president, tallied 36.9% of the ballots cast. Macri was close behind with 34.3%.
Scioli, the handpicked choice of outgoing President Cristina Fernandez, needed at least 40% and a 10-percentage-point advantage to avoid a second round of voting.
When it became clear he would not win outright, Scioli emerged from his...