BERLIN: Reigning world 200m champion Allyson Felix said Friday she will use her defeat in last August's final at the Beijing Olympics to help her bid for gold at the World Athletics Championships here.

At the 2007 worlds in Osaka, Felix defended the 200m crown she first won in Helsinki in 2005, but her arch-rival Veronica Campbell-Brown of Jamaica has walked off with the gold medals over 200m at the last two Olympic Games.

Jamaica's sprinters swept the board at the women's 100m in Beijing and Felix is hoping her United States team can ruin the gold and green sprint party at Berlin's Olympic Stadium when the 200m heats start on Wednesday.

"The Jamaican success in Beijing was obvious," said Felix, who took silver in the Chinese capital behind 200m winner Campbell-Brown and Kerron Stewart in bronze.

"I had a disappointing time at the Olympics, but I've tried to learn a lot from it and take away a few positive things.

"It made my season start a bit slowly this year, because I took a lot of time off, but I feel fit and rejuvenated and looking forward to these world championships."

While Campbell-Brown has two Olympic 200m crowns, Felix is bidding for her third straight world title and she says the Jamaican is the biggest threat to her hat-trick attempt.

"My main competition is Veronica Campbell-Brown, she is reigning Olympic champion and I am excited about another chance to race her again," said Felix.

"Once the competition begins I drive off that and each round I look to go a little better.

"The battle with the Jamaicans has been going on for a long time, a lot of us have been competing with them for a long time even before college.

"The rivalry with us and Jamaica is exciting, it's nothing new, but it's motivating and will make for fast races. It feels good to beat anyone, not just the Jamaicans."

Felix comes to Berlin having run the fastest time in the world this season when she clocked 21.88sec in Stockholm last month, but insists Florence Griffith-Joyner's record of 21.34sec set at the Seoul Olympic Games in 1988 is outside her reach.

"I would love to set a new world record, but it is a long way out there and you have to take baby steps at a major championships," said the American.