ATP chairman Andrea Gaudenzi has insisted Jannik Sinner's doping case was "run by the book" with no preferential treatment, and expressed confidence that tennis would survive should the Italian be banned.

World number one Jannik Sinner said Friday he did not know when the highest court in sport will deliver its verdict as ATP chairman Andrea Gaudenzi stressed the Italian's doping case was "run by the book".

World number one Jannik Sinner said Friday he had done nothing wrong as ATP chairman Andrea Gaudenzi stressed the Italian's doping case was "run by the book" with no preferential treatment. "I am 100 percent sure that there has not been any preferential treatment.

Jannik Sinner is defiant in his innocence despite the consistent jibes levelled at him by Nick Kyrgios who has been heavily critical of the World No.1 since he tested positive twice for the substance Clostebol which was confirmed in November.

Nick Kyrgios has vowed to turn his potential match against Jannik Sinner into "an absolute riot" if they meet at the Australian Open. Kyrgios, who has been a vocal critic of world No. 1 and defending champion Sinner over his two positive doping tests last year,

Nick Kyrgios has thrown down the gauntlet to World No. 1 Jannik Sinner ahead of the Australian Open, vowing to create chaos if they meet at Melbourne Park. Speaking on the Nothing Major podcast, Kyrgios declared: "I would just get every single person in the crowd to get on him.