Thomas Barr secured automatic qualification for the World Athletics Championship 400m hurdles semi-finals on Saturday night with a brilliant run in Oregon.
The 29-year-old clocked a season's best 49.15 to finish second in heat 4 behind Estonian Rasmus Magi.
Barr will go in the semis in the early hours of Monday morning.
Andrew Coscoran, a semi-finalist at the Tokyo Games, competes in heat 1 of the men's 1500m at 2.30am on Sunday morning.
In the early hours of Saturday morning the Irish mixed relay team finished eighth in their final.
The quartet made up of Christopher O'Donnell, Sophie Becker, Jack Raftery and Sharlene Mawdsley finished in a time of 3:16.86 from lane five, with Dominican Republic, Netherlands and the United States' teams taking the top three places on the podium. The Dominicans won in a time of 3:09.82.
Ireland had made the final after finishing an impressive second in their heat with Rhasidat Adeleke in the team and running a stunning last leg.
But she was unable to take part in the final having been ill following that earlier heat according to Athletics Ireland and Mawdsley was brought in to take her place.