Novak Djokovic has posted a scan of his injured left hamstring on social media in a none-too-subtle riposte to the "experts" who've questioned the authenticity of the injury that forced him to retire from his Australian Open semi-final.
Djokovic was left unimpressed by the booing he received from the Melbourne crowd when he pulled the plug on his match with Alexander Zverev after losing a draining opening set in a tiebreak on Friday.
