Cuba's Odlanier Solis outpointed Viktar Zuyev of Belarus to take the Olympic heavyweight gold medal.
Zuyev started strongly and trailed only by one point after the opening round but the powerful Cuban then moved up a gear to win a 22-13 decision.
Solis succeeds compatriot Felix Savon, who retired after winning his third heavyweight title in Sydney in 2004.
Cuba have now won the heavyweight title at their last seven Olympics. They boycotted the 1984 and 1988 Games.