London Olympics: Day one of swimming

United States’ Michael Phelps placed fourth in the 400-meter individual medley swimming final.   (Mark J. Terrill / Associated Press)

Sun Yang celebrates winning the gold medal in the men’s 400m freestyle.   (Robert Gauthier / Los Angeles Times)

United States’ Peter Vanderkaay, standing, finished third while China’s Sun Yang, foreground, won the gold medal in the men’s 400-meter freestyle swimming final.  (Daniel Ochoa De Olza / Associated Press)

Michelle Obama, left, with Summer Sanders-Schlopy support the U.S. swim team during the evening session in London.  (Clive Rose / Getty Images)

U.S. swimmer Elizabeth Beisel floats to the edge of the pool moments after winning the silver medal in the women’s 400m individual medley.   (Robert Gauthier / Los Angeles Times)

United States’ Elizabeth Beisel does the backstroke on her way to winning the silver medal in the women’s 400m individual medley.  (Robert Gauthier / Los Angeles Times)

United States’ Elizabeth Beisel celebrates with her silver medal for the women’s 400-meter individual medley swimming final.  (Mark J. Terrill / Associated Press)

Jessica Hardy, left, and Missy Franklin of the United States cheer teammates during the final of the women’s 4x100m freestyle relay. The U.S. team won the bronze medal.  (Al Bello / Getty Images)

China’s Ye Shiwen won the women’s 400m individual medley final.   (Emmanuel Dunand / AFP / Getty Images)

Australia’s women’s relay team members Cate Campbell, left, Alicia Coutts, right, and Melanie Schlanger, bottom, celebrate their gold medal win in the women’s 4x100-meter freestyle relay.  (Lee Jin-man / Associated Press)

Australians Melanie Schlanger, Alicia Coutts, Brittany Elmslie and Cate Campbell celebrate after winning the gold medal in the women’s 4x100m freestyle relay.  (Hannibal / EPA)