He was second in his heat.
Waterford's Thomas Barr is through to the semi-finals of the 400-metres hurdles.
The 29-year-old, who was fourth in the event at the Rio Games, was second in his heat.
Sophie Becker, Phil Healy, Cillin Greene and Christopher O’Donnell go into the mixed 4-by-400-metres relay heats at midday.

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