Nielsen reaches 400m semi-finalspublished at 11:36 British Summer Time 5 August
Women's 400m heats
As we mentioned a little while ago, Laviai Nielsen has qualified for the semi-finals in the women's 400m event.
Her semi-final will take place on Wednesday evening, with the final, should Nielsen get there, taking place on Thursday night.
Amber Anning also qualified for GB.
You can watch Nielsen's heat in full below.