The essentials
Lula won the runoff with 51.8%, reversing a first-round deficit and becoming the first first-round runner-up to win since 1985.
Lula won Brazil's presidential runoff with about 51.8% of the vote, receiving more than 64 million votes compared with just under 60 million for Flávio Bolsonaro. The margin is roughly 4.3 to 4.4 million votes.
The result reverses the first round, in which Flávio Bolsonaro led Lula by more than 2.2 million votes. Lula becomes the first first-round runner-up to win the presidency since 1985.
Turnout also shifted between the rounds. Abstention in the runoff fell to 19.21%, down from a record 21.08% in the first round.
The reporting does not detail the regional breakdown of the vote or the factors behind the change in turnout.
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From first-round deficit to runoff victory in one contest
Seen through the first round, the result is a reversal. Flávio Bolsonaro led Lula by more than 2.2 million votes before the runoff, but Lula ended the second round ahead by roughly 4.3 to 4.4 million votes. The shift makes Lula the first first-round runner-up to win the presidency since 1985.
Fewer voters stayed home in the runoff than in the first round
Viewed through participation, the runoff drew a larger share of registered voters than the first round. Abstention dropped from a record 21.08% to 19.21%, a change in how many voters took part between the two rounds. The reporting does not connect this shift to either candidate's vote share.