RIO DE JANEIRO, July 30 (Reuters) - Brazilian championship leaders Sao Paulo crashed 4-0 at home to Santos on Sunday after fielding their reserve team.
Sao Paulo fielded only one regular, goalkeeper Rogerio Ceni, and rested the others for Wednesday's Libertadores Cup tie at home to Mexico's Guadalajara.
After an evenly balanced opening, Santos took control when striker Fabiano scored twice in a three-minute spell before halftime. Denis and Rodrigo Tiui added two more after the break.
Despite the defeat, Sao Paulo stayed top with 29 points from 14 games and Santos moved up to sixth with 24.
'It was Sao Paulo who lost to Santos. There's no difference between first-team players and reserves,' said Santos coach Vanderlei Luxemburgo, who was overlooked by Brazil when they chose former midfielder Dunga as their new coach last week.
'Each big club has a squad which is not just restricted to 11 players.'
Internacional moved up to second with 26 points after drawing 0-0 at home to arch-rivals Gremio in Porto Alegre.
Play was twice interrupted in the second half as Gremio fans threw portable toilets into the moat around the pitch and set them on fire.
Defending champions Corinthians stayed rooted to the bottom with 10 points after they lost 1-0 at fellow strugglers Santa Cruz.
Midfielder Marcio Alemao outjumped the defence to head the only goal in the second half and condemn Corinthians to their tenth defeat in 14 outings.
Coach Geninho said he had offered his resignation afterwards but it was not accepted.
'They asked me to carry on and we're going to fight hard to get out of this situation,' said Geninho, who has been in charge for nine games.
Flamengo, who won the Copa Brasil on Wednesday, slipped into the relegation zone after losing 1-0 at Atletico Paranaense.
Ferreira scored the only goal for Paranaense, who were playing their first game under Oswaldo Alvarez, their third coach this year.
Sao Caetano drew 1-1 at home to Ponte Preta as they remained unbeaten under former Brazil coach Emerson Leao, who began the championship with Palmeiras.
Palmeiras, meanwhile, beat Parana 4-2 to claim their fourth straight win since the competition resumed following the World Cup to climb out of the relegation zone.