Jannik Sinner targets clay and grass success amid doping appeal

Jannik Sinner poses with Norman Brookes Challenge Cup in front of the Melbourne skyline (Mark Baker/AP)

Jannik Sinner expects it to take some time before he can replicate his dominance on hard courts at Wimbledon.

The world number one made it three grand slam titles in a row on his favourite surface by successfully defending his Australian Open crown with a straight-sets victory over Alexander Zverev.