Andy Murray proved his fitness by coming from a set down to beat unseeded Australian James Duckworth in the first round at Wimbledon. Britain’s two-time former champion, who has been battling a stomach strain, even threw in an underarm serve to the delight of Centre Court. Murray defended his use of an underarm serve saying: ‘If they stand four or five metres behind the baseline, then why would you not do that to try to bring them forward if they’re not comfortable returning there? Tactically, it’s a smart play.’ The former world No 1 ran out a 4-6, 6-3, 6-2, 6-4 winner in two hours and 43 minutes.