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An emotional Jaryd Clifford has dedicated his Paralympic silver medal to his late grandfather, who had bought a ticket to watch him run in Tokyo.
The 22-year-old broke down in tears after being treated trackside following his gallant efforts in the men's 5000m T13 race.
He knocked into other athletes after crossing the line before vomiting, with Australian medical staff checking on his welfare.
Clifford, who has a visual impairment, said his grandfather had hoped to watch him race in Tokyo.
"To my Pa, he had tickets to the race today but he didn't make it, he passed away a few months ago," Clifford told Channel Seven.
"Today and the next few days I'm running for him, I know he'd be proud of me, whatever the result."
Clifford, the reigning world champion, made a move early in the final 400 metres but then couldn't keep pace with Spaniard Yassine Ouhdadi El Ataby, who clocked 14 minutes 34.13 seconds in a personal best time.
Clifford was 1.39 seconds behind to claim his first Paralympics medal after also competing in Rio with a guide runner.
"It wasn't good enough (or) what I wanted today but I gave it everything and I'm pretty cooked and pretty emotional," he said.
"That's a testament to where Para sport is, no medal is a guarantee ever and I knew that.
"This medal means the world to me still."
The Victorian is also competing in the 1500 metres, in which he holds the world record, and the marathon.
"We'll reset and be good to go in 1500," he said.
"It will be a tough field and a tough race but I'll be ready to go."
On Saturday night, decorated Paralympian Evan O'Hanlon claimed bronze in the men's T38 100m final.
O'Hanlon finished third just behind and Great Britain's Thomas Young and China's Zhu Dening.
The 33-year-old already had five gold medals (three in Beijing, two in London) and one silver (Rio) to his name, while he is aiming to qualify Australia for bobsleigh at the next Winter Olympics.
Rhiannon Clarke and Ella Pardy both qualified for the women's 100m T38 final, with Clarke finishing fifth and Pardy coming seventh.
Earlier on Saturday, Madison de Rozario finished fifth in the women's T53/54 5000m, won by American Susannah Scaroni.
Meanwhile Sarah Walsh finished seventh in the women's T64 long jump final, leaping 5.11m.
Alissa Jordaan was due to round out Saturday night's action in the 400m T47 final.