Oscar Pistorius
Track & Field, Men's 400m and Men's 4x400m Relay
The first double-amputee to compete in an able-bodied Olympics, South African sprinter Pistorius is known as the ''Blade Runner'' for his carbon-fiber prostheses. Born without fibulas, Pistorius will also defend his gold medals in the 100m, 200m, and 400m at the Paralympics in London.