“在单打比赛中,大多数选手主要的错误,在于不知道何时进攻、何时防守。”——比尔·蒂尔登在2010年美国网球公开赛中,拉法·纳达尔、诺瓦克·德约科维奇、罗杰·费德勒和吉姆·克里斯特尔斯有什么共同点?那就是这些伟大的网球巨星们,陶醉于自己伟大的防守体系之中。如同俗话说的那样,省钱既是赚钱,这四个人在美网挽救了许多困难的分数,甚至是有些看起来已经被对手板上钉钉要 “The main mistake most players make in singles is that they do not know when to attack or when to defend.” - Bill Tilden At the 2010 US Open, Rafa Nadal, What do Wick Djokovic, Roger Federer, and Jim Cuttle have in common? That these great tennis superstars revel in their great defensive system. As the saying goes, save money is both money, these four individuals in the United States saved many difficult points, and even some seem to have opponents nailed to