Group 1 - The core event of the day was the women's 400m freestyle final, where Chinese swimmer Li Bingjie set a new Asian record and won a silver medal with a time of 3:58.21, defeating her American rival Katie Ledecky, who finished with a time of 3:58.49 [1][2] - The gold medal was claimed by Canadian swimmer Summer McIntosh, who achieved a time of 3:56.26, marking her as a rising star in the swimming world [1][2] - Li Bingjie expressed her surprise and excitement at surpassing Ledecky, emphasizing the significance of this victory for her [2] Group 2 - Young Chinese swimmer Yu Zidi, aged 12, successfully advanced to the finals of the women's 200m individual medley, finishing the semifinals with a time of 2:10.22, placing seventh [2][5] - Yu Zidi expressed her happiness about reaching the finals and her determination to continue improving [5] - In the men's 4x100m freestyle relay, the Chinese team finished fifth with a time of 3:11.15, while the Australian team won gold with a time of 3:08.97 [5][6] Group 3 - In the women's 4x100m freestyle relay, the Chinese team finished fourth with a time of 3:34.17, narrowly missing a medal as they were overtaken by the Netherlands in the final moments [6] - The Australian team won the event with a time of 3:30.60, while the USA and Netherlands secured silver and bronze respectively [6] - The men's 400m freestyle final saw German swimmer Mertens take gold with a time of 3:42.35, while Chinese swimmer Zhang Zhanshuo finished fifth with a time of 3:44.82 [6]