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.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.