Roger Federer says inconsistency of Jannik Sinner’s doping case raises questions

Roger Federer has spoken out on the Jannik Sinner anti-doping case (Steven Paston/PA)

Roger Federer says there are questions to be answered around world number one Jannik Sinner avoiding a suspension after failing two anti-doping tests earlier this year.

Sinner tested positive for a banned substance twice in March but was absolved of fault or negligence by the International Tennis Integrity Agency.