After two Olympic records already this weekend, US swimmer Dana Vollmer set a world record in women's 100m butterfly in 55.98 seconds in London Olympics.
Becoming the first woman to break the 56-second mark in history, Dana helped US dominate the swimming events Sunday.
Dana's world record performance was followed by another similar fete by South African Cameron van der Burgh, who won the gold in a time of 58.46 seconds in Men's 100m breaststroke.
US is leading China in Olympic swimming pool, with 2 golds, one silver and two bronze when reports last came in.
Overall, China is racing ahead with a medal tally of 6 golds, 3 silvers and 2 bronzes on Sunday. US is second with 3-3-2.
South Korea won its seventh consecutive Olympic gold medal in the women's team archery competition, beating China in a rainy final.
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