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The 2015 and 2016 Copa champions took the lead late in the first half against a largely young and inexperienced Japan with a towering header from midfielder Erick Pulgar.
Chile forward Alexis Sanchez continued his resurgent form at the Copa America by scoring the winning goal in his side's 2-1 victory over Ecuador.
Cavani had been sent off in Uruguay's 1-0 defeat to Chile in the 2015 Copa America quarter-finals after being provoked by Gonzalo Jara and he and his team mates celebrated the goal as if it had just won them a trophy.
The game was peppered with 10 yellow cards but with both teams missing key players and fielding experimental line-ups neither was able to break the deadlock.
The four national presidents committed to creating a local organising committee with a representative from each country to coordinate with CONMEBOL, South American football's governing body.
Results 21-25
