The top two teams in each group go into the last 16. In the case of teams finishing level on points, FIFA has put in place seven tie-breakers starting with goal difference and then the number of goals scored in all group matches.
IOC inspectors who visited last year warned that unless the pace of construction picked up soon, some arenas may not be ready in time to host test events ahead of the Games.
Lopetegui blends youth and experience in Spain World Cup squad
Uruguay are all but assured of a place at the 2014 World Cup finals after Edinson Cavani led the twice champions to a 5-0 away rout of Jordan in the first leg of their qualifying playoff on Wednesday.
Football fans were treated to a month long diet of mainly breathless, intoxicating action in Brazil but their team collapsed in the final stages.
The enduring images of the Games will be not just the great sporting achievements - from US swimmer Michael Phelps' 28th Olympic medal to Usain Bolt's historic sprint 'triple triple' - but also the organizational problems, empty seats and crime.
Neymar shrugged off some rough tackling and a missed penalty to score a brilliant solo goal as he led Brazil to a 3-0 win over Paraguay that moved them within sight of the 2018 World Cup finals on Tuesday.
A summary of sports events and sports persons, who made news on Wednesday
A superb 83rd minute free-kick from captain Neymar gave Brazil a winning start under new coach Dunga as they beat Colombia 1-0 in a fiercely contested friendly on Friday.
Drysdale wins close single sculls gold Also, check out late gold medal winners from Day 7...
'Living in Brazil, I had internalised the football mythology of that country, the way I had learnt Mahabharata stories in my childhood. The tragedy at the Maracana stadium in 1950, when a confident Brazil had lost to Uruguay in the finals. They tell the story of this debacle, this 'Hiroshima' that hit them, like the Shias lament the death of Ali. It led to the Brazilian team burning their white uniforms and switching later to Yellow and blue symbolising their national colours,' says Ambassador B S Prakash, India's former envoy to Brazil.
Nike Inc and some other big international companies face a grilling over their powerful role in Brazilian soccer.
Check out the gold medallists on Day 11 of the 2016 Olympic Games in Rio de Janeiro on Tuesday.