LONDON -- Briton Dwain Chambers and American Marion Jones ignited the British Grand Prix with scintillating sprint victories over world class fields on Friday.

European champion Chambers again put Olympic and world champion Maurice Greene in his place by storming to 100 meters success in 9.98 seconds.

It was the fourth time the 24-year-old Englishman has beaten the American this season.

Triple Olympic champion Jones won her much-hyped showdown with archrival Zhanna Pintusevich-Block, gaining revenge for her shock defeat by the Ukrainian at the world championships last year.

"Dwain Chambers 4 - Maurice Greene 1. It's a good tally to have on my CV this year," said Chambers, who admitted after the race that he had been suffering from a cold and had considered pulling out.

"I am busted, busted, busted. I really didn't expect to win here. "Winning the European title has given me great confidence to believe in myself. Now things seem to be going my way and hopefully the tables have been permanently turned."

American Tim Montgomery chased chambers home in 10.05 with Greene, who said recently he had suffered a "technically horrible" season, taking third in 10.06.

Greene was less than magnanimous in defeat saying Chambers had "been lucky".

The women's 100 meters was, as expected, a battle between Jones and Pintusevich-Block, the first head-to-head meeting this season between the two fastest women in the world.

It was the 26-year-old Jones who prevailed with a comfortable victory in 10.97 seconds, ahead of Pintusevich-Block (11.11) and American Chryste Gaines (11.12), Reuters reported.

"There was a lot of pressure because there was such a great array of talent lining up," said Jones, whose dominance at the distance has been tested ever since her archrival stormed to victory -- inflicting a first defeat on Jones since 1997 -- in Edmonton.

"People have asked me about motivation, what more motivation do you need than to line up against the world champion? "I just felt good, it's as simple as that," Jones said.

Pintusevich-Block, who did not compete in the European championships, put her defeat down to a poor start.

"I didn't start very well. The race just didn't come together and Marion ran really well," she said.

Victories for Chambers and Jones overshadowed a memorable night for Felix Sanchez, who secured a unique double.