And the increasing physicality of the modern game, with its emphasis on full-force swings, lunging defense and hardcourt surfaces, has added to the risks for those who play it best.

• 而现代网球对体能的要求越来越高，它的特点是球员常需要全力击球、飞身救球，加上使用硬地球场，都提高了顶尖球员受伤的风险。