"But to run 10.03 seconds one year and 9.69 the next, if you don't question that in a sport with the reputation it has right now, you're a fool. Period."

Former world record holder Powell won in wintry conditions here in a time of 9.87secs - the sixth time he has run sub 10-seconds since the Olympics.

Having defeated two-time world champion Jeremy Wariner in Beijing, US compatriot LaShawn Merritt once again slayed his rival, but by the closest of margins in the men's 400m.

Wariner had a clear lead off the final bend, but Merritt ran him down and dived over the line to win by less than a hundredths of a second.

Wariner vowed to learn the lessons of 2008 to make sure there is no repeat in 2009.

"Next year, I have to work a lot harder to beat LaShawn," he said.

On a bleak day in Stuttgart, America's Beijing silver medal-winner Kerron Clement was unimpressed with the cold German weather as he won the 400m hurdles in 48.96secs.

"The weather was cold - just horrible," he complained.

"Now I am going home to spend my vacation in Los Angeles, just relax and party.

"I won't change anything next year."

With her wedding to New York Giants cornerback Aaron Ross coming up in 2010, Sanya Richards won the 200m in 22.50secs and admitted she was just having fun ahead of planning her big day.

"I get married in February 2010 and we have to start the preparations now," she said.

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