David Popovici claimed Olympic gold in the men's 200m freestyle, while Mollie O'Callaghan won the women's swimming event.
Teenager David Popovici claimed Olympic gold in the men's 200m freestyle, becoming the first swimmer to win gold for Romania.
Popovici, 19, who burst onto the scene by winning the 100m-200m freestyle double at the 2022 World Championships, clocked 1 minute 44.72 seconds, edging out Britain's Matthew Richards (1:44.74) by a fingertip.
Luke Hobson (1:44.79), from the American team, took bronze in a frenetic finish.
It was Popovici's first Olympic medal after missing out at Tokyo 2020, where he finished fourth. He had to work hard to win on Monday alongside Germany's Lukas Maertens, who took the 400m gold on Saturday, opening up a lead in the first 150 metres of the race.
But Popovici finished strongly, outlasting his rivals and touching first in a thrilling finale.
Australia's Mollie O'Callaghan outlasted her training partner, world record holder and defending Olympic champion Ariarne Titmus, to win the women's 200m freestyle.
O'Callaghan stopped the clock in an Olympic record time of 1:53.27, 0.54 seconds ahead of Titmus, while Hong Kong's Siobhan Haughey took bronze.
Just weeks after Titmus took his 200m freestyle world record at the Olympic trials, O'Callaghan turned the tables on his compatriot with a spectacular final lap.
It also thwarted Titmus' bid to become the first swimmer to successfully defend an Olympic gold in the 200-meter freestyle.
Teenager McIntosh takes her first Olympic gold
Canada's 17-year-old Summer McIntosh swept the field to win gold in the women's 400m individual medley, securing her second medal of the Paris Games.
World record holder McIntosh touched the wall in four minutes and 27.71 seconds, a massive 5.69 second lead over silver medallist Katie Grimes. Grimes' US teammate Emma Weyant took the bronze medal.
McIntosh's triumph came two days after she won Olympic silver behind Titmus in the 400-meter freestyle on Saturday.
Ceccon wins gold in backstroke and Smith in breaststroke
World record holder Thomas Ceccon of Italy produced a thrilling final performance to claim gold in the men's 100m backstroke.
The former world champion touched the wall in exactly 52 seconds, beating Chinese silver medallist Xu Jiayu by 0.32 seconds at La Defense Arena. Ryan Murphy of the US team took bronze.
Tatjana Smith claimed South Africa's first gold at the Paris Olympics, adding the 100m breaststroke title to the 200m she won at Tokyo 2021 under her maiden name Schoenmaker.
China's world champion Tang Qianting took the silver medal and Ireland's Mona McSharry shed tears of joy and wonder after an extraordinary three-way battle for bronze.
