Brazil and Neymar suffered another frustrating 90 minutes of Olympic football in Group A after being held by Iraq to a goalless draw on Sunday.
Despite having 77 percent of possession in the game and 20 shots at goal, the Selecao trio of Neymar, Gabriel Jesus and Gabriel Barbosa failed to find the back of the net.
Brazil now sit in second place behind Denmark with two points, ahead of Iraq and South Africa with one game to go.
Arsenal forward Takuma Asano showed why he is so highly rated after helping Japan to a 2-2 comeback in their Olympic Group B game against Colombia at the Rio Games.
The first half ended goalless before Teofilo Gutierrez and an own goal by Hiroki Fujiharu gave the Colombians a 2-0 lead, only for Japan to come back through Asano and Shoya Nakajima.
The result leaves Colombia in second place behind Nigeria, while Japan and Sweden have a lone point with one group game left to play.
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