I don´t see as easy match as you think. NAdal destroyed Monaco yes, but Monaco is just some clay-courter with no weapons against Rafa, it was 100% that Rafa can´t loose. But Delpo has the game to bother Rafa, is tall , should handle his topspin, also he likes Rafa´s slow game, has more time for his shots, especially his huge FH bombs. I think if Delpo will be physically fit, he can win that match. He take Ferrer to 5th sets and Ferrer was playing hell of a match, and i think Ferrer has better ROS than Rafa, so if Delpo will serve big he can win why not. OF course he won´t beat Rafa in 5 sets, because his stamina is how we can see not good enough for that kind of match on clay, but if he will serve big and play agressivly with not many UE - close straight sets win or 3:1 for Delpo in 3-3 and half hours can be done.
Well, Delpo has won one more set over Djokovic on clay than Nadal this year, so who knows