Neymar drew a blank but Seung-Woo Ryu scored a hat-trick on the opening day of the men's Olympic tournament as Portugal won and Denmark, Sweden and Germany all drew.
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Iraq 0-0 Denmark
Brazil 0-0 South Africa
- Both games in Brasilia finished goalless despite the hosts fielding Neymar and Manchester City signing Gabriel Jesus.
Sweden 2-2 Colombia
Nigeria 5-4 Japan
- Teófilo Gutiérrez helped deny Sweden victory while Roma's Sadiq Umar opened the scoring for Nigeria in an extraordinary match where Portuguese side Feirense's Oghenekaro Etebo got four goals.
Mexico 2-2 Germany
Fiji 0-8 South Korea
- Equalisers from Serge Gnabry and Matthias Ginter ensured Germany a point while Bayer Leverkusen's Seung-Woo Ryu hit a hat-trick and fellow UEFA Champions League contenders Son Heung-Min and Hyun Jun Suk were also on target for South Korea.
Portugal 2-0 Argentina
Honduras 3-2 Algeria
- Ángel Correa was among the Argentina players done down by Portugal. This group, like the four others, continues on Sunday.