Olympics: Photographs from day seven

Hyleas Fountain of the US prepares to compete in the heptathlon 100m hurdles heats at the Bird's Nest stadium. She ran a time of 12.78sec Photograph: Alexander Hassenstein/Getty

Runners cross the line in the heptathlon 100m hurdles heat Photograph: Kim Kyung-hoon/Reuters

Shawn Johnson of the US competes on the beam during the individual all-around artistic gymnastics final, in which she won silver Photograph: Dylan Martinez/Reuters

Jamaica's Usain Bolt composes himself before his 100m heat, which he won with a time of 10.20sec Photograph: Thomas Kienzle/AP

The shadows of Roger Federer, left, of Switzerland and his partner and compatriot Stanislas Wawrinka, centre, are pictured as they reach for a towel during their men's doubles quarter-final against Mahesh Bhupathi and Leander Paes of India Photograph: Mark Ralston/AFP

The Czech Republic's Hana Machova fights for the ball with New Zealand's Aneka Kerr during their preliminary round group B basketball match, which the Czech team won 90-59 Photograph: Filippo Monteforte/AFP

China's Jiang Yuyuan performs her vault during the gymnastics individual all-around final. She finished sixth with a score of 60.900 Photograph: Rob Carr/AP

Tyson Gay of the US, wearing No2, wins his 100m heat with a time of 10.22sec. Jose Carlos Moreira of Brazil, No4, ran 10.29sec to come third Photograph: Kay Nietfeld/EPA

Reese Hoffa of the US throws in the shot put qualification round Photograph: Kay Nietfeld/EPA

French heptathlete Antoinette Nana Djimou Ida displays her patriotism with fingernails painted blue, white and red Photograph: Alexander Hassenstein/Getty

Yana Maksimava of Belarus clears the bar in her women's heptathlon high jump qualifying round Photograph: Aly Song/Reuters

The accreditation passes of the shot put candidtaes hang from a table Photograph: Gabriel Bouys/AFP

Diana Pickler of the US collapses on the track after her disappointing run in the heptathlon 100m hurdles heat, with a time of 14.28sec Photograph: Jewel Samad/AFP

Poland's Kamil Kuczynski falls on the track as he competes in the men's track cycling team sprint qualifying Photograph: Daniel Garcia/AFP

Goalkeeper Ildiko Zirighne Sos (13) of Hungary is hugged by Dora Agnes Kisteleki after Hungary defeated Greece 10-4 in a preliminary round women's water polo match Photograph: Mark Humphrey/AP

Asafa Powell reflects on his performance in the 100m heats. The Jamaican overcame a stomach complaint to win in 10.16sec Photograph: Alexander Hassenstein/Getty

Fabien Sanchez of France races around the velodrome during the men's indivdual pursuit Photograph: Clive Rose/Getty

China's Guojie Li competes against Italy's Alfredo Rota during the men's team epee bronze medal match Photograph: Omar Torres /AFP

Veronica Nyaruai Wanjiru of Kenya falls at the water jump in the women's 3000m Steeplechase Heats Photograph: Stu Forster/Getty

Peter Vanderkaay of the US competes in the men's 1500m Freestyle Heats Photograph: Jonathan Ferrey /Getty

Heat 4 of the second round in the men's 100m Photograph: Gero Breloer /EPA