Australian Mollie O'Callaghan grabs gold from teammate Ariarne Titmus

PARIS -- Australia's red-headed rocket Mollie O'Callaghan upset teammate and defending champion Ariarne Titmus to claim gold in the women's 200 meters freestyle at the Paris Olympics on Monday.

O'Callaghan stopped the clock in an Olympic record 1:53.27 at La Defense Arena, 0.54 seconds ahead of Titmus, with Hong Kong's Siobhan Haughey taking bronze.

Only weeks after Titmus swiped her world record at Olympic trials, O'Callaghan turned the tables on her club swimming teammate with a sizzling final lap.

She also foiled Titmus's bid to become the first swimmer to successfully defend a 200 freestyle Olympic gold medal.

--Women's 400m individual medley

Canadian teenager Summer McIntosh blew away two United States competitors and the rest of the field to win gold in the women's 400 meters individual medley (IM) at the Paris Olympics on Monday, securing her second medal of the 2024 Games.

World record holder McIntosh touched the wall in four minutes 27.71 seconds, far ahead of American silver medalist Katie Grimes and her bronze-winning U.S. teammate Emma Weyant.

McIntosh's triumph came two days after she took silver behind Australian powerhouse Ariarne Titmus in the 400m freestyle.

McIntosh narrowly missed out on a podium and came home fourth at the age of just 14 in 2021 in Tokyo.

--Women's 100m breaststroke

South Africa's Tatjana Smith won the women's 100-meter breaststroke gold, adding to the 200m title she won at Tokyo 2021 under her maiden name of Schoenmaker.

China's world champion Tang Qianting took the silver medal and Ireland's Mona McSharry the bronze.

--Reuters, Special to Field Level Media