They take place in Oregon, US.
Teen sensation Rhasidat Adeleke will hope to help Ireland make a good start to the World Championships in Eugene, Oregon later.
The Dubliner is part of the 4-by-400 mixed relay team, who go in the second of two heats at 7.45 this evening.
Kerry's David Kenny competes in the men's 20-k walk.
Sarah Healy goes in the heats of the women's 15-hundred metres
And Eric Favors and John Kelly are in shot put qualifying.

Thursday Morning Sports Update
Kildare U20 Football Team & Panel vs Offaly
Wednesday Morning Sport Update
New Report Shows Growing Pressure On Volunteers At GAA Club
RG Snyman's Season Ends Due To Injury
Tuesday Morning Sports Update
Carla Ward Names ROI Women's Squad For FIFA World Cup European Qualifiers
Tottenham Believed To Be In Discussion With Roberto De Zerbi Over Club's Vacant Managers Role