Rio put on a scrappy but impressive opening ceremony to launch the 2016 Summer Olympic Games on Friday night. However, the men's football competition got underway on Thursday, with the women's event kicking off a day before that.
One of the biggest moments of the tournament so far came in the Group D clash between Portugal and Argentina. That said, it wasn't a piece of footballing brilliance but rather a very costly mistake with the game finely poised.
Coming up against a side which included Diego Simeone's son Giovanni, Portugal took the lead in the 66th minute through Goncalo Paciencia's powerfully driven shot. However, for goalkeeper Geronimo Rulli, things were about to get a whole lot worse just six minutes from time.
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Argentina, who did not appear at London 2012, were pushing for an equaliser late on. Those efforts quickly became futile because, as you can see in the video below, Rulli produced a huge error to gift the Portuguese a second goal and all but ensure their victory:
The 24-year-old shot-stopper poorly mishandled Pite's speculative long-range effort, which was in excess of 25 yards. This allowed the ball to trickle embarrassingly in between his legs and into the back of the net.
Rulli has been a first-team regular at Spanish club Real Sociedad over the past two seasons, but his mistake condemned Argentina's men's Olympic football team to their first loss in 20 years.
On Sunday, Portugal will look to build on their opening win when they take on Honduras, while the Argentinians must try to bounce back against Algeria.
What is the worst goalkeeping mistake in football history? Have YOUR say in the comments box below!