Nigeria and Portugal became the first teams to qualify for the Olympic men s football tournament quarter-finals, while hosts Brazil were held again.
The 2008 runners-up Nigeria backed up their thrilling 5-4 win over Japan with a 1-0 victory against Group B opponents Sweden, courtesy of Sadiq Umar s first-half goal.
Portugal, who defeated Argentina in their Rio 2016 opener, made it two wins from two in Group D on Sunday with a 2-1 come-from-behind triumph against Honduras.
Neymar s Brazil are still without a goal from their opening two Group A games of the tournament, held to another 0-0 draw, this time by Iraq.
Denmark boosted their chances of progression to the next round with a tense 1-0 win against South Africa, while Argentina got off the mark …