Both Brazilians struck in the second half added time at the Saint Petersburg Stadium to hand the five-time World Cup winners their first victory in the tournament.
Brazil, who were held 1-1 by Switzerland on Sunday, now have four points from two matches.
After Friday's loss, Costa Rica's chances of advancing are over as they had suffered a 0-1 defeat in their campaign opener against Serbia.
Brazil will have to beat Serbia in their third and last match while Costa Rica will take on Switzerland on June 27.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
