It was a disappointing first session at the World Athletics Championships as Ireland's mixed relay team failed to make it through to the final in Tokyo.
The quartet of Jack Raftery (Donore Harriers), Sophie Becker (Raheny Shamrock AC), Conor Kelly (Finn Valley AC) and Sharlene Mawdsley (Newport AC) settled for sixth in their race, and as a result, failed to progress.
The European gold medallists, with Tipperary native Mawdsley running the last leg, posted a time of 3:13.59.
"It's a learning experience," said Mawdsley. "You can’t have an off day at a World Championships and that’s clearly what we had.
"It's our own fault, we made mistakes in the race, but we've learned so much from it, for next year going into the Europeans. We're defending champions and we'll want to put our best foot forward then, so we'll be back."
In the men's 35km Race Walk, Mullingar Harriers athlete Oisin Lane finished in 28th position, making his world championships debut.
"It was very tough. It's a huge surprise, in the last 10k I was just trying to finish," he said.
"I was moving nicely, found a good flow, then at 25k just everything blew up at once, the stomach went, the legs went, the head went, and they stopped giving out sponges on the course so it was harder to cool down."
There was further disappointment for Team Ireland in the men's shot put as Eric Favors failed to qualify.
"I couldn't do it on the day, it’s a tough one," said Favors.
Watch the World Athletics Championships with RTÉ Sport, with coverage on RTÉ2 and the RTE Player at 9.45am on Saturday morning
