It was a very positive start for the Waterford man
Thomas Barr finished second in the heats of the 400m hurdles and is through to the next round.
The Waterford athlete set a time of 48.93 to finish just behind Keisuke Nozawa of Japan.
That was a season's best time for Barr.
His run put him comfortably in the qualification spots for a place in the semi-final, setting the 10th fastest time in the heats.
Annsert Whyte who was fastest in the heats overall, was 0.56 seconds faster than Barr.