Weird, but honestly, I can see a bigger threat in Murray than Federer... Still, Djokovic is the only REAL threat, the only one who can stop Rafa from winning his 7th Roland Garros...
If Novak beat him in Rome he would become either the favorite or atleast equal to win Roland Garros. Rafa's biggest threat is Novak, then his knees, then Murray, but Andy unfortunately could only beat him if he was not 100%. Nobody is touching him in 5 sets if he is healthy except for the #1, if and when they play.