Yago Pikachu on Saturday netted the winner for the four-time Brazilian top-flight champions with a 20th-minute strike, reports Xinhua news agency.
The result at the Sao Januario Stadium here left Vasco sixth in the 20-team standings while Avai were last.
Meanwhile, a first-half goal from defender Sidcley gave Atletico Paranaense a 1-0 victory away to Atletico Goianiense.
In Saturday's only other match, Ponte Preta held Santos to a 0-0 draw at the latter's Vila Belmiro stadium.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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