O'Callaghan, McKeown in ominous Olympic form at Australian championships

In a high-calibre field featuring five of the 10 fastest performers in history, O'Callaghan touched first on the Gold Coast in 52.27 seconds. Meg Harris (52.59), Tokyo Olympic champion Emma McKeon (53.09) and Shayna Jack (53.20) were all under the qualifying time needed to make Paris, while Cate Campbell and Brianna Throssell narrowly missed it. It sets up a huge battle at the Australian Olympic trials in Brisbane in June with just two slots available. "Pretty good time. I would have liked faster...