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His whole business model, practised and perfected over decades, has had to change.

She said there were robust systems in place to keep children safe which includes "having clear procedures in place such as lockdown and safety processes which are regularly practised at the school".

"The more I practised the worse I got. It took 18 months to untangle the rubbish I put inside my head by complicating the game."

England tend to struggle against spin, hence the desire before the winter tours to spend time in the United Arab Emirates where they practised on turning wickets.

Djokovic had not practised at Melbourne Park since Tuesday night's victory, cancelling a planned hit on Thursday before spending an hour warming up on court shortly before the semi-final.