At World Juniors, Olivia Weinsch of Australia dazzles with 52.61 relay split and 24.60 50 free.  

The Australian female sprinting stable keeps growing.   

The Australian girls' 400-meter free relay defeated the US with Olivia Wunsch's 52.   

Erika Pelaez, an NC State recruit, was the only other U.S.    

swimmer in the field sub-54 with a 53.89 anchor, more than a second slower than Wunsch's epic split.   

Wunsch's 52.61 split is quicker than all American World Championships competitors save Kate Douglass (52.28),    

but slower than Australia's world-record-breaking quartet of Mollie O'Callaghan (52.08),    

Shayna Jack (51.69), Meg Harris (52.29), and Emma McKeon (51.90).    

Wunsch's new lifetime best in the 50-meter freestyle would have qualified him for the World Championships final this year,    

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