Corinthians beat local rival Sao Paulo 3-0 in front of 28,862 fans, Corinthians tweeted. Match tickets had been given out for free during the week.
Corinthians won the first leg 1-0.
The previous record was in 2017 at Manaus' Arena Amazonia in the semifinals of the Brazilian championship when Iranduba lost 2-1 to Santos in front of 25,371 people.
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