South Africa's Caster Semenya competes in the women's 800m heats held at the Olympic Stadium in London, England on the 8th August 2012 ©Barry Aldworth/BackpagePix

Anaso Jobodwana competes in the Mens 200m semifinals, qualifies for the final during the Olympic Games Athletics at the Olympic Park, London on 08 August 2012 ©Gavin Barker/BackpagePix

Caster Semenya comeptes in the Womens 800m heats during the Olympic Games Athletics at the Olympic Park, London on 08 August 2012 ©Gavin Barker/BackpagePix

Anaso Jobodwana competes in the Mens 200m semifinals, second to winner of heat Usain Bolt (left) and Aldemir Da Silva (centre) during the Olympic Games Athletics at the Olympic Park, London on 08 August 2012 ©Gavin Barker/BackpagePix

South Africa's Willem Coertzen in the mens decathlon 100m sprint held at the Olympic Stadium in London, England on the 8th August 2012 ©Barry Aldworth/BackpagePix

Lehann Fourie competes in the Mens 110m hurdles semifinals, qualifies for the final during the Olympic Games Athletics at the Olympic Park, London on 08 August 2012 ©Gavin Barker/BackpagePix

Anaso Jobodwana competes in the Mens 200m semifinals, second to winner of heat Usain Bolt (left) and Aldemir Da Silva (centre) during the Olympic Games Athletics at the Olympic Park, London on 08 August 2012 ©Gavin Barker/BackpagePix

South Africa's Caster Semenya competes in the women's 800m heats held at the Olympic Stadium in London, England on the 8th August 2012 ©Barry Aldworth/BackpagePix

Anaso Jobodwana competes in the Mens 200m semifinals, qualifies for the final during the Olympic Games Athletics at the Olympic Park, London on 08 August 2012 ©Gavin Barker/BackpagePix

New Zealand's Brent Newdick in the mens decathlon 100m sprint held at the Olympic Stadium in London, England on the 8th August 2012 ©Barry Aldworth/BackpagePix

South Africa's Caster Semenya competes in the women's 800m heats held at the Olympic Stadium in London, England on the 8th August 2012 ©Barry Aldworth/BackpagePix

Anaso Jobodwana competes in the Mens 200m semifinals during the Olympic Games Athletics at the Olympic Park, London on 08 August 2012 ©Gavin Barker/BackpagePix

South Africa's Willem Coertzen in the mens decathlon 100m sprint held at the Olympic Stadium in London, England on the 8th August 2012 ©Barry Aldworth/BackpagePix

Lehann Fourie of South Africa competes in the mens 110 m hurdle semi finals held at the Olympic Stadium in London, England on the 8th August 2012 ©Barry Aldworth/BackpagePix

Anaso Jobodwana competes in the Mens 200m semifinals during the Olympic Games Athletics at the Olympic Park, London on 08 August 2012 ©Gavin Barker/BackpagePix

South Africa's Caster Semenya competes in the women's 800m heats held at the Olympic Stadium in London, England on the 8th August 2012 ©Barry Aldworth/BackpagePix