一个人若不付出一些无知的代价,就永远不会幸福。
I’ve had to work very hard for every title. Nothing has been given to me.
"When you do something best in life, you don’t really want to give that up – and for me it’s tennis."
Happiness lies in the joy of achievement and the thrill of creative effort.
成功不在于目的地,而在于旅程。