内容摘要："If they'd done their job properly, then it wouldn't have happened," he added.

"If they'd done their job properly, then it wouldn't have happened," he added.

"In two years, Sinner would simply have had a slap on the wrist," one source from an anti-doping organisation told BBC Sport.Some top players continue to believe Sinner has been given preferential treatment because of his status.

Both the International Tennis Integrity Agency (ITIA) and Wada flatly reject any suggestion that is the case.But it is clear Sinner - and five-time women's major champion Iga Swiatek, who received a one-month suspension last year after testing positive for heart medication trimetazidine - have benefitted from being able to pay top lawyers to act quickly."A majority of the players don't feel that it's fair," said 24-time Grand Slam champion Novak Djokovic.

"It appears that you can almost affect the outcome if you are a top player, if you have access to the top lawyers."Sinner's lawyer said he thought the swift resolution of the case came down to taking an "unusual" legal approach.

"From day one [Jannik] didn't challenge the science, he didn't challenge the test, didn't challenge the rules," Singer told BBC Sport.

"He accepted, even though it's a trace - it's a billionth of a gram - he accepted that he was liable for what was in his body.Trofodermin is readily available in Italy for skin abrasions, cuts and wounds.

It contains Clostebol, a steroid that can build muscle mass and enhance athletic performance.Neither Naldi nor Ferrara were found by the independent tribunal to have intentionally acted to break doping rules.

According to Italian law, the packaging on Trofodermin must have a visible "doping" warning.Over the past few years several Italian athletes - across tennis, football and athletics - have tested positive for clostebol.