Summer McIntosh captured her fourth gold medal at the world swimming championships by winning the 400-meter individual medley on Sunday in Singapore. McIntosh, an 18-year-old from Toronto, finished the race in 4 minutes, 25.78 seconds, nearly 7.5 seconds better than Australia's Jenna Forrester and Japan's Mio Narita. McIntosh also secured gold in the 200-meter butterfly, 200-meter medley and 400-meter freestyle as well as the bronze in the 800-meter freestyle. She joined American star Katie Ledecky as the only other female swimmer to claim four individual golds at a world championships, with the latter winning the 200-, 400-, 800- and 1,500-meter freestyle in 2015. Also Sunday, the United States' women's 4x100 medley team of Regan Smith, Kate Douglass, Gretchen Walsh and Torri Huske broke their own record by finishing the event in 3:49.34, That was 0.29 better than the previous mark. "This is the best way to end the meet," Walsh said. "And I feel like we have such a good opportunity when you have this stacked group of women closing it out on a relay like this. "We're going to leave Singapore with a smile on our faces." From a team perspective, the Americans recorded nine gold medals -- one better than Australia. France finished third followed by Canada, which saw McIntosh win all of its golds. --Field Level Media