Andy Murray battles past James Duckworth in winning return to US Open

• Scot opens campaign with 6-7, 6-3, 7-5, 6-3 victory
• ‘I’m very happy to be back,’ says former world No 1The last time Andy Murray played more than three sets in one match he moved over the Centre Court grass at Wimbledon like Hercules – Harold Steptoe’s horse, not the Roman god. On the hardcourt of Louis Armstrong Stadium on Monday the former US Open champion was more spritely than that hobbling beast and rekindled a smattering of his best moments