Ireland's Joe Ward lost to Carlos Andres Mina of Ecuador on a split decision in their second round bout in Rio.
The Irish light heavyweight received two public warnings from the referee during the fight, leading to point deductions at the end of the second and third rounds.
Ward won the first round 10-9 on two of the judges' scorecards, with the Ecuadorian awarded the round 10-9 on the final card.
However, Mina's lumbering style made things difficult for Ward and at the end of the second round the Ecuadorian was ahead 19-18 on two cards after the first of two point deductions was imposed on Ward.
While Ward fought gallantly in the final round in an effort to save the fight, it was not to be and he will play no further part in the Rio games.
A disappointed Joe Ward says his opponent made it hard to implement his game plan #RTErio2016 https://t.co/AorI4XbLVz
— RTÉ Sport (@RTEsport) August 10, 2016
Three Irish boxers - Ward, David Oliver Joyce and Paddy Barnes - have all been eliminated so far during the games, while Michael O'Reilly was banned due to doping offences.
"I'm very disappointed," the 22-year-old told RTÉ Sport afterwards. "I thought I did enough to win the fight.
"There's always a gameplan going in there. It was working but he was messing it up because he was really rugged, pulling and ragging. What can you say? That's boxing.
"It was a long time coming. It's very disappointing the way it went, but I just have to get on with it now and see where I go from here."
