By Julian Linden NEW YORK (Reuters) - Andy Murray strolled into the U.S. National Tennis Center on Saturday without a care in the world, brimming with confidence and self-belief as he prepares to defend his U.S. Open title. Signing autographs and joking with the media, the Scotsman's relaxed demeanour could not have been any different than when he arrived at Flushing Meadows a year ago. And this time he plans to do something he forgot to last year. He wants to enjoy himself. In 2012, Murray arrived in New York still searching for his first grand slam title. ... Click here to read full news..