Lula has 46% of valid votes in the 1st round, says Real Time Big Data
The institute heard 2,000 voters between September 26 and 30.

TL;DR
- Lula leads the first round with 46% of valid votes; Flávio Bolsonaro has 41%.
- Several simulated second-round matchups show tight races.
- In one scenario, Flávio Bolsonaro defeats Lula 51% to 49%.
- In another scenario, Lula defeats Romeu Zema 53% to 47%.