The Belfast fighter was beaten 15-0 by Zou in Beijing four years ago and despite a vastly-improved showing in the ExCeL Arena, he could not exact revenge, defeated on countback after the judges scored the bout level at 15-15.
Barnes slipped 8-5 behind in the first bout but Zou backed off thereafter, tieing the next round 3-3 and then being soundly beaten in the third as Barnes connected with a series of rights and lefts as he went all out to cut the deficit.
He successfully did that, but not enough to progress to the gold medal match.
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