Australia’s Ariarne Titmus, 20, beat America’s Katie Ledecky, 24,  in the 400m freestyle swimming final at the Tokyo Olympics on Monday, earning gold for Australia.

Swimming in lane three, Titmus clocked in 3:56:69 and beat the US champion, while also making her Olympic debut.

With this win, Titmus becomes the first Aussie woman to win the 400m freestyle at the Olympic Games since Shane Gould went for Gold in 1972.

“I can’t believe it. I’m trying to contain my emotions,” Titmus said following the race.

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“This past year, I don’t know if it’s gone fast or slow but more than anything, to get here was a relief. Then to come here and do the job, I’m over the moon.”

Swimming legend Ledecky came in second, clocking in 3:57.36, followed by China’s Li Bingjie (4:01.08) in third place.

With this result, Ledecky – a five-time gold medallist in the past two Olympics – noted her first-ever loss in an individual event at the Olympics.