Oliveira's Rio failurepublished at 14:01 British Summer Time 12 September 2016
Rio Paralympics 2016
Elizabeth Hudson
BBC Sport's Paralympics reporter in Rio
One of the greatest stories of unfulfilled potential here in Rio has been that of Brazil's Alan Oliveira.
Four years ago in London as a 20-year-old, the double amputee sprinter caused a real stir, beating Oscar Pistorius to win gold in the T44 200m final, prompting an angry outburst from the South African about the length of his blades.
He went on to win three golds at the 2013 Worlds in Lyon and looked like becoming a superstar of the sport and the poster boy for these Games, but since then it has all gone wrong.
He took a break after Lyon, claiming exhaustion, but has struggled to find his focus ever since. In addition, he has piled on the pounds and is now almost unrecognisable from the London hero of four years ago.
He failed to make the final of the T44 100m, won by Jonnie Peacock and was as unimpressive in Sunday night's 200m heats, not even progressing as a faster loser.
"He could have been a Brazilian superstar and set up for life but he has just thrown it all away - it's very sad," BBC Radio 5 live expert Baroness Tanni Grey-Thompson told me.
"He has missed the opportunity of his life."