A dead-heat between Australian swimmer Emma McKeon and a Chinese swimmer is under the spotlight after replay footage showed her touch the wall first.
McKeon was declared equal fastest to Yufei Zhang after the pair tied the 100m Butterfly heat at the Tokyo Olympics.
The pair swam the distance in just 55.82 seconds - a new Commonwealth record - and the race was declared a dead-heat.
Replay footage of the final leg of the race appears to show McKeon touch the wall a fraction of a second before her opponent.
A dead-heat between Emma McKeon (right) and a Chinese swimmer (left, Yufei Zhang) has been put under the spotlight after replay footage appeared to show the Australian competitor touch the wall first and finish the race before her rival