EUGENE, Ore. -- Oscar Pistorius is trying to become the first double-amputee to run in the Olympics this summer in London. The chances are dwindling for the South African.

Pistorius ran the 400 meters at the Prefontaine Classic on Saturday in 46.86 seconds, well below the Olympic A standard of 45.30. He thinks he needs to reach that mark in an international meet before June 30 for the South African athletics federation to consider him for the Olympics.

Pistorius finished last in a strong field at the Diamond League event. American LaShawn Merritt won it in 44.91.

Known as The Blade Runner for his carbon-fiber prosthetic legs, Pistorius ran the A standard earlier this season, finishing in 45.20 in the South African capital of Pretoria in March.

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