“If you play with Rafa (especially on the clay), you need to understand how he plays, to see his strengths. We must not forget that Nadal is left-handed. This changes the whole style of the match. I will have two days to prepare. It’s better than nothing We’ll have to train with a lefty. On the ground, I haven’t played with lefties yet, so you need to rebuild, “the Tour press service quotes Federer.