Rio 2016 round-up: Neymar's Brazil draw blank against Iraq

Hosts Brazil are still without a win at the Rio Olympic games after drawing 0-0 with tournament minnows Iraq in Brasilia.

The Selecao, led by Barcelona star Neymar, failed to break down their Group A counterparts to record a second consecutive stalemate in the men's football competition.

Rogerio Micale's men are also searching for their first goal after being held to a 0-0 draw against South Africa in their opening fixture.

Elsewhere in the tournament, Portugal and Nigeria became the first teams to qualify for the quarter-finals.

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.

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.