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Edinson Cavani of Argentina's Boca Juniors heads the ball during a Copa Libertadores quarterfinal second leg soccer match against Argentina's Racing Club at Presidente Peron stadium in Buenos Aires, Argentina, Wednesday, Aug.

Yordan Osorio of Venezuela's Zamora, left, heads a ball next to Juan Cruz of Argentina's Boca Juniors during their Copa Libertadores soccer match in Barinas, Venezuela, Tuesday, March 17, 2015. (AP Photo/Fernando

Damian Diaz of Ecuador's Barcelona, left, heads the ball with Rodrigo Viega of Uruguay's Progreso, during a Copa Libertadores soccer match at the Alfredo Victor Viera Park stadium in Montevideo, Uruguay, Wednesday

Gustavo Gomez of Brazil's Palmeiras heads the ball challenged by Carlos Carmona of Chile's Colo Colo, right, during a quarter final second leg Copa Libertadores soccer match in Sao Paulo, Brazil, Wednesday

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Tensions spike in Rio de Janeiro ahead of Copa Libertadores soccer final and after Copacabana brawl