Pistorius knocked out of 400

London, England – Double amputee Oscar Pistorius of South Africa was eliminated from medal contention in the men's 400 meters Sunday after finishing last in his semifinal heat at the London Olympics.

Pistorius qualified for the semis with a run of 45.44 seconds on Saturday but he was over a second slower than that on Sunday, finishing the race in 46.54 seconds.

Lalonde Gordon of Trinidad and Tobago had the fastest time of the semifinals with a run of 44.58, while Jonathan Borlee was the last to qualify for the final at 44.99 seconds.

The 25-year-old Pistorius is the first man to compete in both the Summer and Paralympic Games. He still has a shot at medaling in London, as he's expected to run in the men's 1,600-meter relay later in the week.

Pistorius, who had both his legs amputated halfway between the knees and ankles at 11 months old, runs with the help of carbon fiber artificial limbs.