Defender Gum headed a late, late winner for the Rio giants.
Closest rivals Atletico Mineiro are nine points behind after also winning, 2-1 against Sport.
Meanwhile Palmeiras’ hopes of avoiding relegation were given a fresh blow as they lost 1-0 to Nautico.
What is your opinion? Feel free to discuss the article under. You have to comment by using your Facebook profile. Be fair and have respect for other people and opinions!
Who of Europe’s top strikers will move to England this summer?
After a dreadful start to their Bundesliga campaign, Borussia Dortmund appear to have weathered the storm after going five matches without defeat.