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TURIN, Italy — The chairman of the ATP Tour acknowledges there "could have been better communication" in explaining the rules involved in the doping case of top-ranked Jannik Sinner. But ATP chairman Andrea Gaudenzi says that anyone hinting that a "double standard" was applied because of Sinner's status is "unfair because the rules have been the same." A decision by an independent tribunal to clear Sinner of wrongdoing was appealed and a final ruling on the case is expected early next year. Gaudenzi made his comments at the ATP Finals in Turin on Thursday during a round-table discussion with international reporters to mark his first public comments on the case.