Mollie O'Callaghan

When Australia’s swimmers topped the medal tally at the 2023 World Championships in Fukuoka, Japan, teenage sensation Mollie O’Callaghan was the star of the show.

Over eight days of intense competition, Australia collected 13 gold, seven silver and five bronze medals for a staggering total of 25 medals – and set five world records.

Although she came into the meet under a shadow after suffering a knee injury during training, Mollie won six medals in total – five of them gold – and was involved in four of the world records.

Mollie won gold in the 100m freestyle with a victory over the woman she describes as her “idol”, Australia’s greatest ever Olympian, Emma McKeon. That came two nights after mowing down Ariarne Titmus in the final stages of the 200m freestyle, after turning in seventh place at the 50m mark, in a world record time of 01:52.85.

That made her the first woman ever to do the 100m-200m double at a world championship.

Mollie opened her meet by joining Shayna Jack, Meg Harris and Emma to claim gold in the 4x100m freestyle relay in a world record time of 3:27.96.

A hint of what was to come was provided in 2022 when Mollie was named Swimming World’s Female Performer of the Year. One would have thought that two gold medals at her debut Olympics in Tokyo the year earlier might have sounded the alarm, but both were won as a heat swimmer in the 4x100m freestyle and 4x100m medley relays.

There was no way that 18-year-old Mollie’s victory in the 100m freestyle at the World Championships in Budapest could be ignored. Nor could her efforts in winning the same event at the Birmingham 2022 Commonwealth Games, especially considering she showed the way home to Emma.

Again she was the lead-off swimmer when Australia won gold in the 4x200m freestyle relay, combining with Shayna, Ariarne and Brianna Throssell to post another world record, 7:37.50.

There was more gold and another world record in the mixed 4x100m freestyle relay, where she swam with Shayna, Kyle Chalmers and Jack Cartwright for a time of 3:18.83.

She topped if off with silver in the women’s 4x100m medley relay.

She became the fifth Australian to win the world and Commonwealth 100m freestyle double – joining Jodie Henry, Libby Trickett and the Campbell sisters, Cate and Bronte. Her world number one ranking time of 52.49sec further bolstered Australia’s hopes of claiming a fourth straight 4x100m freestyle relay title at Paris 2024.

Mollie also came to the fore with her efforts in the world record-breaking feats of the Australian 4x200m freestyle team at the Commonwealth Games and the world short course titles in Melbourne, while also causing eyebrows to raise appreciatively as she claimed silver behind Olympic champions Ariarne and Kaylee McKeown in the Birmingham 200m freestyle and the Melbourne 100m backstroke respectively.

Dean Boxall has been highly praised for his performances in coaching Ariarne, but he is gaining even further respect for his work with Mollie, another quiet swimmer who lets her performances in the water speak for her.

At the Australian swimming championships on the Gold Coast in April, Mollie won gold in the 100m, the 200m freestyle, the 100m backstroke and won silver in the 50m backstroke.

Mollie and Ariarne went head-to-head in a thrilling finish to the 200m freestyle final at the Australian Olympic trials in Brisbane in June, with Ariarne winning in a time (1:52.23) that smashed Mollie’s previous world record of 1:52.85. Mollie finished second, but also had a time that would have broken the record, stopping the clock in 1:52.48.

At the Paris 2024 Olympics Mollie and Kaylee McKeown were Australia's most awarded Olympians with five Olympic medals.

The first individual Olympic gold medal of Mollie's career came in the highly anticipated 200m freestyle final in a winning time of 1:53.27, surging past teammate and defending Olympic champion Ariarne (1:53.81) who claimed silver.

The women's 4x100m and 4x200m freestyle relays brought in two more gold for Mollie, with the 4x100m triumph being Australia's fourth consecutive Olympic gold medal in the event.

Silver in the women's 4x100m medley relay and bronze in the mixed 4x100m medley relay gave a medal of every colour from Paris. The only event she didn't get a medal for her efforts in was the 100m freestyle, in which she came fourth.

At 20 years of age with two Olympics and eight Olympic medals under her belt (five gold, one silver, two bronze), the only Australian with more Olympic gold is her idol Emma, on six.