WADA appeals Jannik Sinner positive doping test ruling and seeks lengthy ban

World number one Jannik Sinner is facing the renewed threat of a ban after the World Anti-Doping Agency launched an appeal against a ruling of "no fault or negligence" for two positive tests he returned in March.

Sinner, who won the US Open earlier this month, twice tested positive for an anabolic steroid in March but on 20 August the International Tennis Integrity Agency determined he was not to blame and imposed no punishment.

The ITIA accepted Sinner's explanation that the banned substance entered his body as a result of a massage from his physio, who had used a spray containing the steroid to treat a cut on their finger.

But WADA has appealed to the Court of Arbitration for Sport, seeking to impose a ban of up to two years on the 23-year-old Italian.

A statement from the agency said: "It is WADA’s view that the finding of 'no fault or negligence’ was not correct under the applicable rules.

"WADA is seeking a period of ineligibility of between one and two years. WADA is not seeking a disqualification of any results, save that which has already been imposed by the tribunal of first instance."

Three weeks ago, Sinner won the US Open, the second grand slam event victory of his career, following on from his Australian Open triumph in January.