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Irish boxer Paddy Barnes says he will never fight at 49kg again following his light-flyweight defeat to Spain's Samuel Carmona Heredia.
The Belfast boxer, who was targeting a third consecutive Olympic medal after winning bronze in 2008 and 2012, suffered a surprise defeat in the light-flyweight class at the Riocentro.
The Chinese judge gave the verdict 29-28 to Barnes, but the Canadian and Uzbekistani judges scored it 29-28 to the Spaniard.
"To be honest I should not be fighting at this weight - it is so hard getting down to it," Barnes told RTE.
"This morning will be the last time I fight at 49kg, ever."
The 29-year-old, who was Ireland's flag bearer at the opening ceremony, says he ran out of energy as early as the first round.
"In the second round I had nothing left, and I don't know how I threw those punches. Even midway through the first round, I was dead and I was gone," he continued.
"It is always hard to make the weight. I have to train differently to come down from 58kg. There were questions as to whether I would make the weight, and I only just made it.
"I was favourite for gold, and I genuinely believed that I would come away with a gold medal. But if even if I had come through that fight, I would have been hammered [in the next bout] because I had no energy.
"It's just as well I got beaten because I would have been embarrassed next week."
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