Brazil needed an extra-time winner from Malcom to claim Olympic gold with a 2-1 win over Spain on Saturday.
The game headed into extra-time when Mikel Oyarzabal ruled out Matheus Cunha's opener but former Barcelona man Malcom scored after 109 minutes to seal the win for Brazil.
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Brazil are the first nation to retain their Olympic crown since rivals Argentina won consecutive gold medals in 2004 and 2008.