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.

New York City Defender Kevin O'Toole In Ireland Squad For Final World Cup Qualifiers
The Ireland Team Have Been Named For Their Game Against Japan
Thursday Morning Sports Update
Tipperary Have Seven Players Included On This Year's PwC Hurling All-Star Team
Ellistown's Michael Noonan Scores 1 of 4 Goals To Beat Panama In The Under-17 World Cup Campaign
Ireland U17's Make History As They Play In Today's FIFA U17 World Cup
Wednesday Morning Sports Update
Kildare Primary Schools Soccer Finals Results