TOPSHOTS Great Britain's Anna Bentley (L) fences against Canada's Monica Peterson during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

France's Sofiane Milous (R) competes with Japan's Hiroaki Hiraoka during their men's -60 kgs contest match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / FRANCK FIFE

Japan's Hiroaki Hiraoka (L) competes with France's Sofiane Milous during their men's -60 kgs contest match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / JOHANNES EISELE

Japan's Hiroaki Hiraoka (L) competes with France's Sofiane Milous during their men's -60 kgs contest match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / FRANCK FIFE

Germany's Dirk Schrade on King Artus competes in the dressage event of the eventing competition of the 2012 London Olympics at the Equestrian venue in Greenwich Park, London, July 28, 2012. AFP PHOTO / JOHN MACDOUGALL

Australias' Christian Sprenger reacts after he competed in the men's 100m breaststroke heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / LEON NEAL

France's gymnast Cyril Tommasone competes on the rings during the men's qualification of the artistic gymnastics event of the London Olympic Games on July 28, 2012 at the 02 North Greenwich Arena in London. AFP PHOTO / THOMAS COEX

Hungary's Daniel Gyurta reacts after competing in the men's 100m breaststroke heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / LEON NEAL

Senegal's Malick Fall competes in the men's 100m breaststroke heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / LEON NEAL

(R-L) Australia's Christopher Morgan, Karsten Forsterling, James McRae and Daniel Noonan compete in the men's quarduple sculls heat 2 of the rowing event during the London 2012 Olympic Games, at Eton Dorney Rowing Centre in Eton, west of London, on July 28, 2012. AFP PHOTO / ERIC FEFERBERG

An athlete perform on the rings before the men's qualification of the artistic gymnastics event of the London Olympic Games on July 28, 2012 at the 02 North Greenwich Arena in London. AFP PHOTO / THOMAS COEX

China's Gold medalist Yi Siling celebrates on the podium after winning the 10m air rifle women's final at the London 2012 Olympic Games at the Royal Artillery Barracks in London on July 28, 2012. AFP PHOTO/ KHALED DESOUKI

Russia's Kamilla Gafurzianova (L) fences against Poland's Martyna Synoradzka during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

Russia's Kamilla Gafurzianova (L) fences against Poland's Martyna Synoradzka during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

France's Sofiane Milous (L) competes with Japan's Hiroaki Hiraoka during their men's -60 kgs contest match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / JOHANNES EISELE

France's Giacomo Perez-Dortona reacts after winning his men's 100m breaststroke heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / EMMANUEL DUNAND

Serbia's Janko Tipsarevic returns a ball against Argentina's David Nalbandian during their tennis match of the 2012 London Olympic Games at the All England Tennis Club in Wimbledon, southwest London, on July 28,2012. AFP PHOTO/ Martin Bernetti

Argentina's David Nalbandian returns the ball against Serbia's Janko Tipsarevic during their tennis match of the 2012 London Olympic Games at the All England Tennis Club in Wimbledon, southwest London, on July 28,2012. AFP PHOTO/ Martin Bernetti

China's Yi Siling look through her rifle sights during the 10m air rifle women's final at the London 2012 Olympic Games at the Royal Artillery Barracks in London, July 28, 2012. Yi Siling grabbed the first gold of the games. AFP PHOTO/MARWAN NAAMANI

Russia's Kamilla Gafurzianova (L) fences against Poland's Martyna Synoradzka during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

Russian players celebrate after winning the Women's preliminary round group B basketball match of the London 2012 Olympic Games Canada vs Russia on July 28, 2012 at the basketball arena in London. Russia won 58 to 53. AFP PHOTO / MARK RALSTON

A competitor rows past a banner of the London 2012 Olympic Games as he competes in the rowing event of the Games, at Eton Dorney Rowing Centre in Eton, west of London, on July 28, 2012. AFP PHOTO / DAMIEN MEYER

Serbia's Ana Ivanovic celebrates winning a point against US' Christina McHale during their women's single tennis match of the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO/Luis Acosta

Russian forwards Evgeniya Belyakova (R) and Anna Petrakova celebrate after winning the Women's preliminary round group B basketball match of the London 2012 Olympic Games Canada vs Russia on July 28, 2012 at the basketball arena in London. Russia won 58 to 53. AFP PHOTO / MARK RALSTON

Tunisia's Ines Boubakri celebrates her victory over US fencer Nicole Ross at the end of their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. Boubakri won the bout. AFP PHOTO / TOSHIFUMI KITAMURA

Russian players celebrate after winning the Women's preliminary round group B basketball match of the London 2012 Olympic Games Canada vs Russia on July 28, 2012 at the basketball arena in London. Russia won 58 to 53. AFP PHOTO / MARK RALSTON

Britain's David Florence and Richard Hounslow practice during a Canoe double Slalom training session on July 28, 2012 at " Lee Valley Water Park", in London. AFP PHOTO OLIVIER MORIN

Tunisia's Ines Boubakri (R) fences against US fencer Nicole Ross during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. Boubakri won the bout. AFP PHOTO / TOSHIFUMI KITAMURA

China's players react after winning a point during the women's volleyball match between Serbia and China in the 2012 London Olympic Games in London on July 28, 2012. AFP PHOTO/KIRILL KUDRYAVTSEV

Canadian guard Teresa Gabriele (R) tries to score a basket during the Women's preliminary round group B basketball match of the London 2012 Olympic Games Canada vs Russia on July 28, 2012 at the basketball arena in London. Russia won 58 to 53. AFP PHOTO / MARK RALSTON

Mawussi Agbetoglo of Togo returns a ball to Justin Han of Australia during a table tennis men's singles preliminary round match of the London 2012 Olympic Games at the Excel centre in London on July 28, 2012. AFP PHOTO / Saeed Khan

Zhang Lily of the US serves to Cornelia Molnar of Croatia during a table tennis women's singles preliminary round match of the London 2012 Olympic Games at the Excel centre in London on July 28, 2012. AFP PHOTO / Saeed Khan

South Korea's gymnast Kim Soo Myun competes on the rings during the men's qualification of the artistic gymnastics event of the London Olympic Games on July 28, 2012 at the 02 North Greenwich Arena in London. AFP PHOTO / THOMAS COEX

Cheerleaders perform on the Centre Court of Horse Guards Parade stadium during the men's Beach Volleyball preliminary phase - Pool B match Germany's Julius Brink and Jonas Reckermann against Russia's Konstatin Semenov and Sergey Prokopyev during the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / DANIEL GARCIA

China's players react after winning a point during the women's volleyball match between Serbia and China in the 2012 London Olympic Games in London on July 28, 2012. AFP PHOTO/KIRILL KUDRYAVTSEV

Sweden's midfielder Kosovare Asllani (R) fights with Japan's midfielder Nahomi Kawasumi during the London 2012 Olympic women's football match between Japan and Sweden on July 28, 2012 at The City of Coventry Stadium in Coventry, central England. AFP PHOTO/PAUL ELLIS

Cornelia Molnar of Croatia serves to Zhang Lily of the US during a table tennis women's singles preliminary round match of the London 2012 Olympic Games at the Excel centre in London on July 28, 2012. AFP PHOTO / Saeed Khan

Cheerleaders perform a routine during a break in the men's Beach Volleyball preliminary phase - Pool B match of the London 2012 Olympic Games between Germany's Julius Brink and Jonas Reckermann and Russia's Konstatin Semenov and Sergey Prokopyev on The Centre Court Stadium on Horse Guards Parade in London on July 28, 2012 AFP PHOTO / DANIEL GARCIA

Serbia's Janko Tipsarevic celebrates winning a men's singles tennis match against Argentina's David Nalbandian during the London 2012 Olympic Games at the All England Tennis Club in Wimbledon, southwest London, on July 28,2012. Tipsarevic won 6-3, 6-4. AFP PHOTO/ Martin Bernetti

China's Hu Minghai and Shu Junrong practice during a Canoe Double men's Slalom training session on July 28, 2012 at " Lee Valley Water Park", in London. AFP PHOTO OLIVIER MORIN

Japan's Toshiyuki Tanaka on Marquis de Plescop competes in the Dressage event of the Eventing competition of the 2012 London Olympics at the Equestrian venue in Greenwich Park, London on July 28, 2012. AFP PHOTO / JOHN MACDOUGALL

US athlete Scott Parsons practises during a kayak men's slalom training session on July 28, 2012 at " Lee Valley Water Park" in London during the 2012 Olympic Games. AFP PHOTO OLIVIER MORIN

Great Britain's gymnast Max Whitlock competes on the floor during the men's qualification of the artistic gymnastics event of the London Olympic Games on July 28, 2012 at the 02 North Greenwich Arena in London. AFP PHOTO / BEN STANSALL

Britain's Hannah Miley smiles after competing in the women's 400m individual medley heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / LEON NEAL

US athletes Eric Hurd and Jeff Larimer practise during a double canoe men's slalom training session on July 28, 2012 at " Lee Valley Water Park" in London during the 2012 Olympic Games. AFP PHOTO OLIVIER MORIN

Competitors in the 10m air pistol men qualification fire at the Royal Artillery Barracks in London on July 28, 2012 during the London 2012 Olympic Games. AFP PHOTO / KHALED DESOUKI

Joseph Diaz Jr (R) of the US defends against Pavlo Ishchenko (L) of the Ukraine during their round of 32 Bantam (56Kg) bout of the 2012 London Olympic Games on July 28, 2012 at the ExCel Arena in London. Diaz took a 19-9 points decision victory. AFP PHOTO / Jack GUEZ

France's Etienne Daille practises during a kayak men's Slalom training session on July 28, 2012 at " Lee Valley Water Park" in London during the 2012 Olympic Games. AFP PHOTO OLIVIER MORIN

France's Emilie Fer practises during a kayak men's slalom training session on July 28, 2012 at " Lee Valley Water Park" in London during the 2012 Olympic Games. AFP PHOTO OLIVIER MORIN

US swimmer Michael Phelps competes in the men's 400m individual medley heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / POOL / AL BELLO

US swimmer Michael Phelps competes in the men's 400m individual medley heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / POOL / AL BELLO

Poland's Grzegorz Kiljanek practises during a canoe men's slalom training session on July 28, 2012 at " Lee Valley Water Park" in London during the 2012 Olympic Games. AFP PHOTO OLIVIER MORIN

Poland's Grzegorz Kiljanek practises during a canoe men's slalom training session on July 28, 2012 at " Lee Valley Water Park" in London during the 2012 Olympic Games. AFP PHOTO OLIVIER MORIN

Poland's Mateusz Polaczyk waves during a canoe men's slalom training session on July 28, 2012 at " Lee Valley Water Park" in London during the 2012 Olympic Games. AFP PHOTO OLIVIER MORIN

US swimmer Dana Vollmer splashes water before the women's 100m butterfly heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / POOL / AL BELLO

Hungary's Eva Csernoviczki (L) competes with China's Wu Shugen during their women's -48 kgs contest match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / FRANCK FIFE

Britain's Hannah Miley waves after she competed in the women's 400m individual medley heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / EMMANUEL DUNAND

An athlete holds his weapon as he competes in the 10m air pistol men qualification at The London 2012 Olympic Games at the Royal Artillery Barracks in London on July 28, 2012. AFP PHOTO / KHALED DESOUKI

(L-R) United States's Anthony Fahden, William Newell, Nicholas La Cava and Robin Prendes compete in the men's lightweight four heat 1of the rowing event during the London 2012 Olympic Games, at Eton Dorney Rowing Centre in Eton, west of London, on July 28, 2012. AFP PHOTO / ERIC FEFERBERG

China's Chen Xiaodong (L) fences against Poland's Malgorzata Wojtkowiak during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

China's Chen Xiaodong (foreground R) fences against Italy's Valentina Vezzali during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

Hungary's Eva Csernoviczki (top) celebrates after winning against with China's Wu Shugen during their women's -48 kgs contest match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / JOHANNES EISELE

Hungary's Eva Csernoviczki (top) celebrates after winning against with China's Wu Shugen during their women's -48 kgs contest match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / ADRIAN DENNIS

US swimmer Elizabeth Beisel reacts after she competed in the women's 400m individual medley heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / FABRICE COFFRINI

(R-L) Great Britain's Peter Chambers, Rob Williams, Richard Chambers and Chris Bartley compete in the men's lightweight four heat 2 of the rowing event during the London 2012 Olympic Games, at Eton Dorney Rowing Centre in Eton, west of London, on July 28, 2012. AFP PHOTO / ERIC FEFERBERG

Japan's Kazuki Yazawa rests after a kayak men's slalom training session on July 28, 2012 at " Lee Valley Water Park" in London during the 2012 Olympic Games. AFP PHOTO OLIVIER MORIN

Italy's Valentina Vezzali (L) fences against Japan's Nishioka Shiho during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

South Korea's women's hockey team practice during a training session at the Riverbank Arena in London on July 28, 2012, on the first day of the London 2012 Olympic Games. AFP PHOTO/ INDRANIL MUKHERJEE

A picture shows a general view of spectators in the stands watching the action on the first day of the swimming competition at the London 2012 Olympic Games in London on July 28, 2012. AFP PHOTO / LEON NEAL

Slovenia's Maja Tvrdy returns to Britain's Susan Egelstaff during their women's singles Group H badminton match at the London 2012 Olympic game in London on July 28, 2012. Susan Egelstaff won 21-15, 21-10. AFP PHOTO / ADEK BERRY

South Korea's women's hockey players practice during a training session at the Riverbank Arena in London on July 28, 2012, on the first day of the London 2012 Olympic Games. AFP PHOTO/ INDRANIL MUKHERJEE

(From L) China's bronze medalist Yu Dan, Russia's Daria Vdovina and China's gold medalist Yi Siling compete in the 10m air rifle women final at the London 2012 Olympic Games at the Royal Artillery Barracks in London on July 28, 2012. AFP PHOTO/MARWAN NAAMANI

China's Chen Jinyan (L) fences against Poland's Malgorzata Wojtkowiak during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

China's Chen Jinyan (L) fences against Poland's Malgorzata Wojtkowiak during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

China's Chen Jinyan (L) fences against Poland's Malgorzata Wojtkowiak during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

Romania's Alina Dumitru celebrates after defeating Japan's Tomoko Fukumi during their women's -48 kgs contest semi-final match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / JOHANNES EISELE

Iran's Elaheh Ahmadi gestures at the end of the 10m air rifle women final at the London 2012 Olympic Games at the Royal Artillery Barracks in London on July 28, 2012. AFP PHOTO/MARWAN NAAMANI

Romania's Alina Dumitru celebrates after defeating Japan's Tomoko Fukumi during their women's -48 kgs contest semi-final match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / FRANCK FIFE

Robenilson Vieira de Jesus of Brazil is fanned in his corner during his round of 32 Bantam (56Kg) bout against Orzubek Shayimov of Uzbekistan in the 2012 London Olympic Games on July 28, 2012 at the ExCel Arena in London. Vieira de Jesus won on a 13-7 points decision. AFP PHOTO / Jack GUEZ

Chu Sian Cheng of Malaysia shoots the arrow as he competes in the men's team archery eliminations match between Mexico and Malaysia at the Lord's Cricket Ground in London on July 27, 2012 during the London 2012 Olympic Games. AFP PHOTO / PAUL GILHAM

Brazil's Sarah Menezes (R) competes with Belgium's Charline Van Snick during their women's -48 kgs contest semi-final match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / FRANCK FIFE

New Zealand's Mahe Drysdale competes in the men's single sculls heat 4 of the rowing event during the London 2012 Olympic Games, at Eton Dorney Rowing Centre in Eton, west of London, on July 28, 2012. AFP PHOTO / ERIC FEFERBERG

Japan's Ikehata Kanae (L) fences against Poland's Sylwia Gruchala during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / TOSHIFUMI KITAMURA

Japan's Ikehata Kanae (L) fences against Poland's Sylwia Gruchala during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / TOSHIFUMI KITAMURA

Japan's Ikehata Kanae (L) shakes hands with Poland's Sylwia Gruchala at the end of their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. Ikehata won the bout. AFP PHOTO / TOSHIFUMI KITAMURA

Iran's Soulmaz Abbasiazad waits for the start of the women's single sculls heat 1 of the rowing event during the London 2012 Olympic Games, at Eton Dorney Rowing Centre in Eton, west of London, on July 28, 2012. AFP PHOTO / ERIC FEFERBERG

Iran's Soulmaz Abbasiazad competes in the women's single sculls heat 1 of the rowing event during the London 2012 Olympic Games, at Eton Dorney Rowing Centre in Eton, west of London, on July 28, 2012. AFP PHOTO / ERIC FEFERBERG

Brazil's centreback Ana Paula Rodrigues (L) vies with Croatia's rightback Kristina Franic during the women's preliminaries Group A handball match Croatia vs Brazil for the London 2012 Olympics Games on July 28, 2012 at the Copper Box hall in London. AFP PHOTO/ JAVIER SORIANO

Spectators applaud as the peleton rides up Boxhill on the outskirts of London on July 28, 2012, during the men's cycling road race for The 2012 London Olympic Games. AFP PHOTO / MIGUEL MEDINA

Spectators applaud as the peleton rides up Boxhill on the outskirts of London on July 28, 2012, during the men's cycling road race for The 2012 London Olympic Games. AFP PHOTO / MIGUEL MEDINA

Poland's athlete Sylwia Bogacka (L) looks at Chinese Siling Yi before competing in the10m air rifle women final of the London 2012 Olympic Games at the Royal Artillery Barracks in London, on July 28, 2012. Siling Yi took the gold medal and Sylwia Bogacka the silver. AFP PHOTO/MARWAN NAAMANI

Croatia's Mario Vekic competes in the men's single sculls heat 6 of the rowing event during the London 2012 Olympic Games, at Eton Dorney Rowing Centre in Eton, west of London, on July 28, 2012. AFP PHOTO / ERIC FEFERBERG

Japan's Ikehata Kanae (L) fences against France's Ysaora Thibus during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / TOSHIFUMI KITAMURA

Brazil's goalkeeper Chana Masson reacts after saving a goal during the women's preliminaries Group A handball match Croatia vs Brazil for the London 2012 Olympics Games on July 28, 2012 at the Copper Box hall in London. AFP PHOTO/ JAVIER SORIANO

TOPSHOTS South Korea's gymnast Kim Seungil competes on the rings during the men's qualification of the artistic gymnastics event of the London Olympic Games on July 28, 2012 at the 02 North Greenwich Arena in London. AFP PHOTO / THOMAS COEX

TOPSHOTS China's gymnast Feng Zhe competes on the parrallel bars during the men's qualification of the artistic gymnastics event of the London Olympic Games on July 28, 2012 at the 02 North Greenwich Arena in London. AFP PHOTO / BEN STANSALL

TOPSHOTS Brazil's Felipe Kitadai (R) competes with Korea's Gwang-Hyeon Choi during their men's -60 kgs contest match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / ADRIAN DENNIS

Brazil's coach Morten Soubak reacts during the women's preliminaries Group A handball match Croatia vs Brazil for the London 2012 Olympics Games on July 28, 2012 at the Copper Box hall in London. AFP PHOTO/ JAVIER SORIANO

TOPSHOTS Robenilson Vieira de Jesus of Brazil absorbs a right from Orzubek Shayimov of Uzbekistan during their round of 32 Bantam (56Kg) bout of the 2012 London Olympic Games on July 28, 2012 at the ExCel Arena in London. Vieira de Jesus won on a 13-7 points decision. AFP PHOTO / Jack GUEZ

TOPSHOTS Slovakia's Michal Martikan practices during a Canoe Slalom training session on July 28, 2012 at " Lee Valley Water Park", in London. AFP PHOTO OLIVIER MORIN

TOPSHOTS Morocco's Jihane Samlal practises during a kayak women's slalom training session on July 28, 2012 at " Lee Valley Water Park" in London during the 2012 Olympic Games. AFP PHOTO OLIVIER MORIN

TOPSHOTS France's Emilie Fer practises during a kayak women's slalom training session on July 28, 2012 at " Lee Valley Water Park" in London during the 2012 Olympic Games. AFP PHOTO OLIVIER MORIN

TOPSHOTS Sweden's defender Sara Thunebro controls the ball during the London 2012 Olympic women's football match between Japan and Sweden on July 28, 2012 at The City of Coventry Stadium in Coventry, central England. AFP PHOTO/PAUL ELLIS

South Africa's defender Zamandosi Cele (L) and Canada's defender Lauren Sesselman compete during the London 2012 Olympic women's football match between Canada and South Africa on July 28, 2012 at The City of Coventry Stadium in Coventry, central England. AFP PHOTO / PAUL LLIS

TOPSHOTS Tunisia's Ines Boubakri celebrates her victory over France's Astrid Guyart during their women's foil fencing bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / TOSHIFUMI KITAMURA

TOPSHOTS Segun Toriola of Nigeria serves to Andre Ho of Canada during a table tennis men's singles preliminary round match of the London 2012 Olympic Games at the Excel centre in London on July 28, 2012. AFP Photo / Saeed Khan

Russia's Arsen Galstyan (R) reacts after winning agaisnt Uzbekistan's Rishod Sobirov during their men's -60 kgs contest semi-final match of the judo event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / ADRIAN DENNIS

Croatia's centreback Miranda Tatari (C) vies with Brazil's pivot Fabiana Diniz during the women's preliminaries Group A handball match Croatia vs Brazil for the London 2012 Olympics Games on July 28, 2012 at the Copper Box hall in London. AFP PHOTO/ JAVIER SORIANO

Serena Williams of the US returns to Serbia's Jelena Jankovic during their women's singles tennis match of the London 2012 Olympic Games at the All England Tennis Club in Wimbledon, southwest London, on July 28, 2012. AFP PHOTO/LUIS ACOSTA

Serena Williams of the US waits for a serve from Serbia's Jelena Jankovic during their women's singles tennis match of the London 2012 Olympic Games at the All England Tennis Club in Wimbledon, southwest London, on July 28, 2012. AFP PHOTO/LUIS ACOSTA

Serena Williams of the US falls to the ground during her women's singles tennis match against Serbia's Jelena Jankovic at the London 2012 Olympic Games at the All England Tennis Club in Wimbledon, southwest London, on July 28, 2012. AFP PHOTO/LUIS ACOSTA

Turkey's Neslihan Yigit prepares to serve against Austria's Simone Prutsch during their women's singles badminton match of the London 2012 Olympic Games in London. Yigit won 21-18, 21-10. AFP PHOTO / ADEK BERRY

Croatia's rightback Andrea Penezic jumps to shoot during the women's preliminaries Group A handball match Croatia vs Brazil for the London 2012 Olympics Games on July 28, 2012 at the Copper Box hall in London. AFP PHOTO/ JAVIER SORIANO

Turkey's Emine Tugba Palazoglu (R) vies with Angolan forward Sonia Guadalupe during the Women's preliminary round group A basketball match of the London 2012 Olympic Games Turkey vs Angola on July 28, 2012 at the basketball arena in London. AFP PHOTO / MARK RALSTON

Kobe Bryant of the US practices on July 28, 2012 at the University of East London during the London 2012 Olympic Games. AFP PHOTO / TIMOTHY A. CLARY

Kobe Bryant of the US practices on July 28, 2012 at the University of East London during the London 2012 Olympic Games. AFP PHOTO / TIMOTHY A. CLARY

Indonesia's Taufik Hidayat hits a return against Czech Republic's Petr Koukal during their men's singles badminton match of the London 2012 Olympic games on July 28, 2012 in London. AFP PHOTO / ADEK BERRY

Brazil's leftback Eduarda Amorim (C) shoots during the women's preliminaries Group A handball match Croatia vs Brazil for the London 2012 Olympics Games on July 28, 2012 at the Copper Box hall in London. AFP PHOTO/ JAVIER SORIANO

Kazakhstan's Alexandre Vinokourov (C) celebrates as he crosses the finish line ahead of Colombia's Rigoberto Uran (L) to win the men's cycling road race event in London during the London 2012 Olympic games on July e28, 2012. AFP PHOTO/CARL DE SOUZA

TOPSHOTS Soldiers manning a surface-to-air missile launcher on an apartment block as part of the London 2012 Olympic security program, look on as a protester waves a Campaign for Nuclear Disarmament (CND) badge during a demonstration against the Olympics in east London on July 28, 2012. AFP PHOTO / CARL COURT

Croatia's rightback Andrea Penezic (L) vies with Brazil's leftback Eduarda Amorim during the women's preliminaries Group A handball match Croatia vs Brazil for the London 2012 Olympics Games on July 28, 2012 at the Copper Box hall in London. Brazil won 24-23. AFP PHOTO/ JAVIER SORIANO

Brazil's forward Cristiane (C) vies for the ball with New Zealand's defender Abby Erceg (L) and New Zealand's defender Rebecca Smith during the London 2012 Olympic Games women's football match between New Zealand and Brazil at the Millennium Stadium in Cardiff, Wales, on July 28, 2012. AFP PHOTO / GLYN KIRK

Tunisia's Ines Boubakri (L) fences against Italy's Valentina Vezzali during their women's foil fencing quarterfinal bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

Japan's gymnast Koji Yamamuro competes on the horizontal bar during the men's qualification of the artistic gymnastics event of the London Olympic Games on July 28, 2012 at the 02 North Greenwich Arena in London. AFP PHOTO / BEN STANSALL

Italy's Valentina Vezzali celebrates her victory over Tunisia's Ines Boubakri during their women's foil fencing quarterfinal bout as part of the London 2012 Olympic games, on July 28, 2012 at the ExCel centre in London. AFP PHOTO / ALBERTO PIZZOLI

Yu Ishizu of Japan lets an arrow fly during the men's Team Archery Eliminations match between Japan and India on Day 1 of the London 2012 Olympic Games at Lord's Cricket Ground on July 28, 2012 in London. AFP PHOTO/JEWEL SAMAD

US swimmer Elizabeth Beisel competes in the women's 400m individual medley heats swimming event at the London 2012 Olympic Games on July 28, 2012 in London. AFP PHOTO / CHRISTOPHE SIMON

Reika Kakiiwa (R) and Mizuki Fujii of Japan watch the shuttlecock during their women's doubles badminton match against India's Jwala Gutta and Ashwini Ponnappa at the London 2012 Olympic Games in London on July 28, 2012. AFP PHOTO / ADEK BERRY