(Reuters) -World number one Jannik Sinner, who is about to return to action after a three-month doping ban, thought about walking away from tennis even while successfully defending his Australian Open title, but is coming back with a new mentality.
Sinner accepted a three-month ban in February after a settlement with the World Anti-Doping Agency, who had appealed to the Court of Arbitration for Sport against an independent tribunal's decision in August to clear him.
