Australian tennis player-turned-commentator Rennae Stubbs has made the shock declaration she thinks Jannik Sinner is "guaranteed" to cop a ban when he fronts the Court of Arbitration for Sport (CAS) in April. Sinner won his second Australian Open and third grand slam title last week, but his immediate future in the sport is under a cloud.

Jannik Sinner looked unbeatable at this year’s Australian Open as he once again dominated German Alexander Zverev in the men’s final on Sunday night.