Michael Diamond has finished without a medal after faltering in the closing stages of the men's trap shooting final at the London Olympics.
The Australian finished the qualification rounds with a world record-equalling faultless 125 shots, but five misses in his last 22 cost him a repeat of the gold he won in Atlanta and Sydney.
"It was just one of those things - a hard day at the office," Diamond told Grandstand.
"I felt really good in my preliminaries and even going into the final I was quietly confident.
"Here I was sitting on a potential Olympic gold or silver. I was really disappointed.
"I anticipated a target. I knew where it was going I just over shot it.
"I got quite annoyed with myself ... I don't usually do that.
"I was just a little bit upset with myself and as a result the second one went flying into the ground again.
Diamond has vowed to be better in Rio in four years, a target he does not believe is beyond him despite the fact he will be 44 in 2016.
"We can only come back stronger and learn from it," Diamond said.
"It's been a great career for me...I'm looking forward to Rio in 2016.
"40-ish isn't too old to be competing at this sport, although the competition is mainly 30-35 (year-olds) at this sport.
"Hopefully I'll be able to go to Rio, that'd be a great feat in my career."
Diamond and Kuwaiti Fehaid Aldeehani finished the final on 145 of a possible 150 shots, one behind Croatia's Giovanni Cernogoraz and Italy's Massimo Fabbrizi on 146.
Aldeehani prevailed in the sudden-death shoot-off for bronze after Diamond missed his fourth attempt.
The gold was taken by Cernogoraz, who won in the sixth round of the shoot-off.
He had shot 24 out of 25 to come from sixth to tie for the lead after the final round.
"This gold medal will be very good for me, my family and the whole country. It is just fantastic," Cernogoraz said.
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