Chambers beat Greene five times in six meetings last season

Dwain Chambers has withdrawn from next week's sprint showdown with Olympic champion Maurice Greene in Boston because of injury.

Chambers, the co-holder of the European 100m record, was scheduled to run against Greene over 60m indoors at the 1 February meeting.

Organisers provided no further details of the injury to Chambers, who beat former world record holder Greene in five of the six times at outdoor meetings last year.

Meanwhile, Greene has admitted his performances had dipped last season but says he is confident of bouncing back.

"I haven't competed for a while with proper training," he said.

"My technique has got to be a lot better. I need to clean it up.

"I have to put my race back together. (Last season) I got away from the things I used to do."