The 31-year-old Jamaican, who has not competed since testing positive for a banned diuretic, hydrochlorothiazide, at a meeting in Kingston on June 1 last year, was banned for two years by the International Association of Athletics Federations (IAAF), but that sanction was overturned by CAS in a ruling which was reported on February 24.

Campbell-Brown's national federation decided in October that she should only receive a public warning after it decided she had not used the substance for any performance-enhancing effect, but the IAAF refused to ratify the decision.

Asked to comment on the case on the eve of competition in Sopot, the IAAF President Lamine Diack responded: "I wish her all success here.

"She tested positive and she accepted the suspension.

"But the decision taken didn't satisfy her. CAS agreed and qualified her to compete, so she runs in Sopot. We wish her much success and that's all we can say."

Veronica Campbell-Brown in full flight during the London 2012 Games ©AFP/Getty Images

He denied that the IAAF had attempted to keep their proposed two-year ban a secret.

"I lost out on the opportunity to compete for most of 2013 and the chance to defend my world (outdoor) 200m title," said Campbell-Brown,

"However, I press on."

The sprinter contested that the rules of the IAAF had not been respected in her case and "had compromised the integrity of the urine sample she gave".

She said that there was no proof that she had violated the anti-doping laws - the three-person CAS panel agreed with her.

They will not publish the reasons for their ruling for several weeks.

Campbell-Brown has won a total of seven Olympic medals and will be seeking her third consecutive World Indoor 60m title.

She faces strong opposition here, however, in the shape of her compatriot, the three-times world champion from Moscow 2013 and double Olympic 100m gold medallist Shelly-Ann Fraser-Pryce, who is making her World Indoor debut.

Murielle Ahoure of the Ivory Coast, last year's World 100 and 200m silver medallist, will also prove a tough competitor to beat.

The first gold medal of the 2014 World Indoor Championships was awarded in the pentathlon to Nadine Broersen of the Netherlands, and Ryan Whiting defended his shot put title with a best effort of 22.05 metres to register the sixth consecutive victory in this event by an American athlete.

An area record of 21.26m with his last throw by New Zealand's Tom Walsh displaced Poland's Olympic champion Tomasz Majewski, from the medal placings despite fervent home support in the Ergo Arena.

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