By Tom Fordyce BBC Sport Online at Crystal Palace

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Dwain Chambers stormed to his fourth straight win of the season over Maurice Greene at the Norwich Union Grand Prix on Friday night and staked his claim to be world number one.

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Chambers, in the form of his life, clocked 9.98 seconds - the fastest legal time by a Briton on home soil - to beat Tim Montgomery (10.05secs) and Greene (10.06secs), despite suffering from a heavy cold.

"It's mind-blowing," said a delighted Chambers afterwards.

"Now he (Greene) knows how we felt in the past.

I had a problem at the start and he got lucky

Maurice Greene

Marion Jones won her 100m showdown with ease

Marion Jones won her long-awaited clash with Zhanna Pintusevich-Block, leading from the gun and dominant to the line.

It was the first time that the Olympic and world champions have met this season, and Jones stamped her authority all over the race to win in 10.97secs.

"There was a lot of pressure on me," said Jones.

"It's been very frustrating not to get the good races, but tonight I just felt good."

Pintusevich-Block, second in 11.11secs with Chrystie Gaines third in 11.12secs, said: "There was a lot of pressure and a lot of confusion.

"I didn't start very well and the race just didn't come together."

In the javelin, Steve Backley was unable to produce the form that took him to European gold a fortnight ago.

Sergey Makarov took revenge for his defeat in Munich with a throw of 86.70m, with Backley back in sixth with 82.49m.

"I am 33 years old," conceded Backley. "In Munich I felt 23, but tonight I felt 43.

"The conditions were perfect, but it just didn't come together."

Steve Backley could not maintain his Munich form

On a night when many of Britain's heroes from the Commonwealths and Europeans struggled to reproduce their best form, Philips Idowu managed to out-jump Jonathan Edwards only to watch Walter Davis leap still further.

The American leapt 17.33m on his penultimate attempt, and Idowu was unable to extend his 17.29m with his final jump of the competition.

There was disappointment for Britain's Matt Elias and Chris Rawlinson in the 400m hurdles, finishing sixth and seventh respectively behind world champion Felix Sanchez.

Sanchez took a few hours' rest and then went out and won the 400m flat for good measure, pushing Daniel Caines into fourth.

Maria Mutola held off Jolanda Ceplak to win the women's 800m.

And Russia's Yuriy Borzakovskiy, who chose to run the 400m at the European Championships, comprehensively beat the man who took silver in Munich, Andre Bucher, in the men's race.

Hicham El Guerrouj coasted to his third successive victory in the Emsley Carr Mile and admitted, "This is very sweet for me."

Bridgette Foster edged former world and Olympic champion Gail Devers into second in the 100m hurdles, while Ethiopia's Berhane Adere out-sprinted Gabriela Szabo to take the 5,000m.