History-making Alex Lee was unable to secure his spot in the men's 100m T64 final at the World Para-Athletics Championships in Dubai.
The Galway native, making his debut in the championships, finished sixth in his heat with a time of 12:10.
Lee finished fifth in the 200m T64 heats on Friday and narrowly missed out on a personal best time in the 100m.
The former League of Ireland footballer became Ireland's first-ever blade runner to compete at the championships.
"Just to be here is a big achievement for me personally," Lee told Paralympics Ireland after his 200m race.
"I didn't think I would be coming here over the summer - I only found out at the end of September.
"You can never prepare yourself for something like this. It's a totally different ball game when you step out into the arena."
Jason Smyth will defend his T13 100m title on 13 November with Michael McKillop in action the following day in the T38 1500m.