Watching Federer take on the French, I'm amazed by how strong his psyche has become. I remember that a few years ago he could play fantastic when things were going well. But if he made a bad error or lost a set or got a bad call, it seemed like he was much more fragile. I remember seeing him cry a lot also. And it seemed like he had more difficulty w/ people like Hewitt and Nalbandian who are grinders and also mentally strong. He's reminding of Sampras in this aspect. So how did he do it? Was it just winning a grand slam that made him tough, or did he win because of his toughness? Was it firing his coach? Reading "Winning Ugly?" Meditation?