On the second day of competition on July 25 , four finals were contested , the women 's 100 m butterfly , men 's 50 m butterfly , women 's 200 m individual medley , and the men 's 100 m breaststroke . In the first final of day two , the women 's 100 m butterfly , American Dana Vollmer won the gold after posting the top times in the heats and semifinals . Vollmer 's winning time of 56.87 was slower than her semifinal time of 56.47 but was still good enough for gold . In the men 's 50 m butterfly , Brazilian César Cielo , just recently cleared to compete after failing a drug test , won in a time of 23.10 . Cielo was very emotional after the race and sobbed uncontrollably . After he said , " This gold medal has a different feel from the other ones . This one was the hardest of my life . " In the women 's 200 m individual medley , fifteen-year-old Chinese Ye Shiwen won the gold in a time of 2:08.90 to give host nation China its first gold in the swimming competition . At the 150 mark , Ye was in fifth place but covered the last 50 metres in 29.42 to surge ahead of American Ariana Kukors and Australian Alicia Coutts for the win . In the men 's 100 m breaststroke Norwegian Alexander Dale Oen won the gold in a time of 58.71 . After the race , he pointed to the Norwegian flag on his swimming cap in reference to the 2011 Norway attacks . No new world or competition records were set during day two
2011 Norway attacks
2011 Norway attacks
2011 World Aquatics Championships