The hosts played for more than an hour with 10 men on Sunday after Diego Souza was shown a straight red card for striking Leo Morais with an elbow to the face in the 34th minute, reports Xinhua news agency.
Fluminense went ahead just after halftime through an Anderson Martins own goal before Colombian forward Trellez headed in a 72nd minute equaliser.
The result at the Morumbi Stadium ensured that Sao Paulo remain top of the of the 20-team standings, three points clear of second-placed Internacional. Fluminense are 11th, 19 points off the pace after 22 matches.
In Rio de Janeiro, Leandro Carvalho scored in second-half stoppage time as Flamengo missed a chance to apply pressure to Sao Paulo by falling 1-0 at home to Ceara.
In other matches on Sunday, Atletico Paranaense won 2-0 at home to Bahia, Sport defeated Parana Clube 1-0, Palmeiras won 2-1 at Chapecoense and International held Cruzeiro to a goalless draw in Belo Horizonte.Read More