Neymar fires four, Flu fight back
The 19-year-old starlet was simply unplayable at Estadio Urbano Caldeira, opening the scoring with a second-minute penalty.
Joffre Guerron levelled for Atletico seven minutes after the break, but Neymar scored a second spot-kick on 55 minutes, completed his hat-trick after 57 and then made it four with 20 remaining.
Elsewhere, Botafogo are third after a 1-0 win over Cruzeiro thanks to Sebastian Abreu's goal ten minutes after half-time.
In the day's other game, two goals from Rafael Sobis helped Fluminense come from behind to win 2-1 at Ceara. Felipe Azevedo netted a seventh-minute opener for the home side, but Sobis turned things around either side of the break.