Dwain Chambers has boosted his campaign to reach the Beijing Olympics by twice running inside the Olympic qualifying standard at a meeting in Germany.

The sprinter clocked 10.06 seconds in his 100m final in Biberach, bettering his 10.14 in the afternoon heats - both easily within the Olympic 'A' standard.

"I've matured a lot and I'm proving I can do it clean," said Chambers.

The British Olympic Association (BOA) has banned Chambers from Beijing but he is expected to challenge the ruling.

"I will always remain a clean athlete from here onwards," added the 30-year-old following his final.