Richards gained revenge for her defeat in Beijing
Britain's Olympic 400m champion Christine Ohuruogu suffered her first loss of the season as Sanya Richards gained revenge for her Beijing defeat.
American Richards, who was favourite for gold at the Olympics but had to settle for bronze, beat Ohuruogu in the World Athletics Final in Stuttgart.
Richards was never threatened, winning in 50.41 seconds, with Ohuruogu second in 50.83, and Novlene Williams third.
It rounded off a good weekend for Richards, who won the 200m on Saturday.
Londoner Ohuruogu remained upbeat after surrendering her eight-race winning streak.
"It's nearly the end of my season, and I'm exhausted. But I'm still glad I came," said the Londoner, who will return to Asia to defend her Shanghai title next weekend.
"It doesn't mean anything in the overall scheme of things," added Ohuruogu of her defeat by Richard. "I have got the biggest accolade in athletics."
Olympic 800m champion Pamela Jelimo of Kenya secured the $1m Golden League jackpot as she cruised to victory in her race.
The 18-year-old, who only started running the distance this year, was the only competitor in any discipline to win her event at each one of the League's six meetings.
She had to turn up in Stuttgart to officially receive the cheque and while she was there she added another $30,000 to her prize fund by winning again, her 12th victory in as many finals this season.
Her compatriot Janeth Jepkosgei edged Britain's Marilyn Okoro for second place, as Jelimo left the pair in her wake in the final straight.
In other events, Britain's Olympic bronze medallist Tasha Danvers fell in the womenís 400m hurdles, clipping the second and failing to recover. She finished eighth in 58.40.
Marlon Devonish finished seventh in the men's 200m in 21.02 and admitted: "To be honest I was just going through the motions. It's been a bad season, it started well but because of the illness and injury it didnít go to plan."
Stephanie Twell set a new personal best of 8.05:89 as she finished seventh in the women's 3,000m.
"I've ended my season on a high and that shows how much this summer has done for me," she said.