Fluminense opened up a nine-point advantage at the top of the Brazilian Campeonato on Thursday night with a 2-1 home win over Coritiba.
Wellington Nem opened the scoring after 15 minutes and Thiago Neves doubled the hosts' lead in the 72nd minute.
Everton Ribeiro pulled a goal back for the visitors nine minutes from time but they could not find an equaliser.
The victory moved Fluminense well clear of second-placed Atletico Mineiro, who have six games remaining.
Elsewhere, Ponte Preta edged their mid-table encounter with Cruzeiro 1-0 thanks to Roger's 33rd-minute strike, while Santos and Nautico Recife battled out a goalless draw.