James beats Merritt to win men's 400

Grenada's Kirani James edged American favorite LaShawn Merritt to win the men's 400 meters Tuesday at the track and field world championships.

James, who qualified sixth-fastest for the final, finished in 44.60 seconds to beat top qualifier Merritt by just .03 seconds. Belgium's Kevin Borlee took third at 44.90 seconds.

On Monday, double-amputee Oscar Pistorius of South Africa failed to qualify for the final. Pistorius runs with carbon-fiber prosthetic blades after his legs were amputated as a baby.

Also on Tuesday, Kenya's David Lekuta Rudisha won the men's 800 meters ahead of Sudan's Abubaker Kaki and Russia's Yuriy Borzakovskiy. American Nick Symmonds was fifth.

Russian Tatyana Chernova won the women's heptathlon, the seven-event competition that ended with the 800 meters on Tuesday. Jessica Ennis of Great Britain was second and Jennifer Oeser of Germany finished third.

Brazilian Fabiana Murer captured the women's pole vault with Germany's Martina Strutz placing second and Russia's Svetlana Feofanova taking third. American Jennifer Suhr was fourth.

Germany's Robert Harding won the discus throw, followed by Estonia's Gerd Kanter and Iran's Ehsan Hadadi.

Russian Yuliya Zaripova won the women's 3,000-meter steeplechase, while Tunisia's Habiba Ghribi finished second and Milcah Chemos Cheywa of Kenya was third.