Originally written on Tennis Panorama  |  Last updated 11/5/14
  (November 5, 2012) PHILADELPHIA - Ever since 2003 when Roger Federer burst onto the tennis scene and began an era of domination, which now extends to the so-called “Big Four” of Federer, Rafael Nadal, Andy Murray, and Novak Djokovic, the tennis world has questioned how long it can go on. As the 2012 tennis season wraps up, with just the World Tour Finals left, that question remains unanswered. Each of the Big Four captured one Slam title apiece this year. “At some stage, things will change. It’s not a question of if, it’s when,” John McEnroe said at a Philadelphia stop on the PowerShares Series Tour. “But it’s hard to say when exactly that will be. Obviously Nadal’s health is an issue, and Roger’s not getting any younger. I suspect that you’ll see these guys hopefully around for a couple more years.” Jim Courier expressed admiration for the way the Big Four have sustained their success, winning an astonishing 30 of the last 31 Majors. “I think what the top four have done has bee
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