US OPEN '13: Murray Aims to Defend 1st Major Title Andy Murray chuckled as he explained the very best part about owning a pair of Grand Slam titles, one from the U.S. Open last year, the other from Wimbledon last month. No more of those nagging, oft-repeated queries - the ones he heard over and over and over again. Not too much for me has changed. But the one thing that's been nice is that, literally for five or six years, I did a press conference before every tournament and after every single match, and I got asked that question, I'd say, 90 percent of the time: Why have you never won Wimbledon? When are you going to win Wimbledon? Why have you not won a Grand Slam? Murray said in an interview with The Associated Press. "So that's the thing that, for me, has been the nicest: Not having to answer that question," he added, standing outside the locker rooms at Arthur Ashe Stadium, not far from the oversized color picture and silver plaque that commemorate his 2012 victory at Flushing Meadows. I can just play tennis now and not have to worry about that anymore. When the year's last major tennis tournament begins on the U.S. Open's blue hard courts Monday, Murray will have other concerns. For example: What might it feel like to successfully defend a Grand Slam championship? That's something he's never tried to do before, of course. Or how many of these can he win? Or, really, will he even be able to win one more? Yes, for a guy who has accomplished so much over the past 13 months, redefining his career and place in the game, Murray still sounds very much like someone harboring quite a bit of uncertainty. His success at the U.S. Open in 2012 did, after all, make him the first British man since Fred Perry in 1936 to win a Grand Slam title. His success at Wimbledon in July, as everyone knows by now, made him the first British man since Perry 77 years ago to earn the singles trophy at the All England Club. Toss in a London Olympics gold medal, and it's been quite a run. He's turned into a great player. He's always been a good hitter of the ball, been a great mover. I think mentally he's a bit better now," 14-time major champion Pete Sampras said recently. Now he feels like he belongs. But Murray also remembers what came before. He remembers - and, much to his chagrin, there was a time when he frequently was reminded of it by others - that he lost each of the first four Grand Slam finals he reached. I know how long it took me to win one and how hard it is to win them. I know it's possible I may not win another one," the 26-year-old from Scotland said, his tone and facial expression earnest. So I just want to keep trying to put myself in position to win Grand Slams and hopefully I can do the same again here. Indeed, Murray anticipates some shakiness at the start of the U.S. Open. Instead of declaring that he will step on court with the bravado of a defending champion, Murray wonders whether his play might be affected in a bad way at the outset of this U.S. Open because of what happened a year ago.