US women set world record in relay at swim worlds, while Summer McIntosh wins fourth gold

US break own record in last event of worlds China’s 12-year-old prodigy Yu Zidi finishes off-podium Summer McIntosh capped a brilliant world championships with the 400 meters individual medley (IM) title and a fourth individual gold medal, while the United States set a world record in the women’s 4x100 medley relay to win the final title in Singapore on Sunday. France’s Leon Marchand roared to victory in the men’s 400 meters IM, while the United States topped the medals table with nine golds,