Football giants clash
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Football
The Olympic football tournament bursts into life with a semifinal between two of the sport's fiercest rivals, Brazil and Argentina, in a contest enlivened by the genius of Ronaldinho and Lionel Messi on opposing sides.
Brazil are hoping for revenge against holders Argentina for defeat in Athens.
Despite winning five World Cups, they have never won Olympic gold and are desperate to set that right.
Ronaldinho is one of three over-age players in a team who otherwise have to be under 23 at the start of the year.
The AC Milan player is being bombarded with autograph requests in the Olympic Village, forcing Brazilian players to surround him at times.
Nigeria play Belgium in the other semi-final.
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