Olympic and World champion Jeremy Wariner won the men's 400m with a world leading time Saturday at the 2007 Osaka Grand Prix in Japan, which is a stop on the 2007 IAAF World Athletics Tour.

Wariner dominated his fellow competitors at Nagai Stadium in finishing in 44.02 seconds, while easing up towards the finish line. Wariner's training partner Darold Williamson was the runner-up, crossing the line in 44.68. Wariner's performance was a Japanese all-comer's record and the fastest ever recorded in the month of May.

"I love the track here," said Wariner, which will be the site of the 11th IAAF World Championships in Athletics this summer from August 25 to September 2. "I've never seen this type of surface. It has a very nice spring to it. I hope to come back in August and set a new world record."

Also in Osaka, reigning World Outdoor men's 400m hurdles champion Bershawn Jackson felt a problem in his left hamstring by the third hurdle but forged ahead to win in the world leading time of 48.13 seconds. The top-three finishers mirrored the medal stand at the 2005 World Outdoor Championships in Helsinki, as James Carter finished as the runner-up in 48.22, with Japan's Dai Tamesue third in 48.73.

For more information on the 2007 Osaka Grand Prix, including the complete results, visit www.iaaf.org.