Sure it was easier to maintain cos he only had to maintain it on 2 surfaces, whereas Federer has to do so on all 3 (well, 4 if you include carpet), and also face another player who is starting to excel on all surfaces too. That's why Federer is an awesome player, since mentally he is able to stand up - Everyone thought he'd be down and out in 3 sets after the Roland Garros final, yet he came back from 2 to love down, and took it to the edge.. That's true greatness.