A season's best performance from Britain's men's 4x400m relay team ensured the quartet qualified for Friday's Olympic final.
Jack Green put in a strong third lap before Martyn Rooney
brought the Brits home in three minutes 0.38 seconds.
"I felt I had a lot to prove," said Green, who crashed out of the first round of the 400m hurdles.
including Oscar Pistorius, failed to finish
but later qualified on appeal.
the first double amputee sprinter to compete at the Olympic Games,
was denied the chance to run in the semi-final as team-mate Ofentse Mogawane fell before he could pass on the baton.
But officials decided Mogawane had been blocked by Kenya's Vincent Kiilu and put the South Africans through to the final.
"It was so exciting. There is no hands-down favourite for the 4x400m. It is wide open and we should aim for a medal.
"Green's speed endurance really came into play in the last 80m. I hope he keeps his place for the final. Rooney elevates himself when he gets the baton in his hand. He is a great anchorman and you would not want anyone else in that leg."
Britain were without world 400m hurdles champion Dai Greene, who
finished fourth in Monday's Olympic final,
but the quartet of Nigel Levine, Conrad Williams, Green and Rooney made strong claims to remain in the line-up for the final.
"I wanted a chance to run after my disappointment in the 400m hurdles," said Green. "I would like to think I deserve to be on this stage."
Rooney crossed the line alongside Deon Lendore, but
Trinidad and Tobago
were awarded first spot despite clocking the same time as the Brits.
Cuba were third, while the
were the top three finishers in the second heat.
also progressed as the two fastest losers.
failed to qualify when
Jermaine Gonzales pulled up injured in the third leg of the second heat.