Andy Murray banks on revenge against Grigor Dimitrov at Australian Open

• Scot believes there will be no repeat of Wimbledon defeat
• ‘I feel pretty calm and there’s no reason why I should be concerned’
• More news from Melbourne ParkAndy Murray smiles nervously when he recalls what Roger Federer did to him at the ATP World Tour Finals in London a few months ago, the night in front of a home audience when he took just a single game off the Swiss – and that a gift. He knows about public embarrassment, the professional athlete’s unwanted companion.