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The 22-year-old was part of the Samba Kings squad who stumbled to a 2-1 defeat at the London Games' climax two years ago, although they were able to exact some revenge after securing a 2-0 win over the Mexicans in the group stages of last year's Confederations Cup.
The two sides will now lock horns once again, this time in Group A at Brazil 2014, and Chelsea playmaker Oscar is hoping to finally put to bed the ghosts of their previous shortcoming.
"Of course I was very sad after the Olympic defeat," said Oscar, who scored Brazil's third in the 3-1 opening day win over Croatia last week.
"It is a medal that Brazil have never won and we lost the final. Mexico are a very good team. It will certainly be as difficult as last year.
"But in the World Cup there is an extra desire to win and I hope we can do so again this time.
"Mexico are a very different side to Croatia. They play the ball out from the back well and are very good on the counter-attack."
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