Titmus seizes 200m freestyle world record from O'Callaghan

MELBOURNE :Ariarne Titmus obliterated the 200 metres freestyle world record at the Australian Olympic trials on Wednesday, upsetting the previous holder Mollie O'Callaghan in an exhilarating final.

Olympic champion Titmus's one minute 52.23 seconds swim at the Brisbane Aquatic Centre shaved more than half a second off O'Callaghan's mark (1:52.85) from the World Championships in Fukuoka as she turned the tables on her rival.

O'Callaghan also smashed her Fukuoka best, clocking 1:52.48 in a swim that would have likely crushed any other rival.

But Titmus, who also holds the 400m world record and Olympic title, is no ordinary foe.

The 23-year-old Tasmanian, nicknamed "Terminator", heads to the Paris Games in great form.

"Looking at the results, that's unbelievable," Titmus said pool-side.

"I'm just happy to finally produce a swim in the 200 that I feel like my training reflects.

"The field that we have is why we're swimming so fast, we push each other every day."

The stunning swim came two nights after Titmus almost reset her 400m world mark on day one of the trials.

The 200m final was a rematch of the Fukuoka decider, when O'Callaghan edged her club-mate Titmus in a thriller for the title.

O'Callaghan made a fast start in Brisbane and held the lead after the first turn.

But Titmus quickly reeled her in and held off the 20-year-old on the back half of the race as fans in the terraces roared them home.

O'Callaghan, the first woman to sweep the 100 and 200m freestyle world titles at Fukuoka, will likely be shoulder-to-shoulder with Titmus in the Paris pool.

She said she had struggled with nerves after smashing her personal best in the 100m backstroke when she finished runner-up to Kaylee McKeown.

"I'm still learning. I'm still really