I wouldn't say DelPo can't beat Rafa on clay. He can outplay Rafa on slow surfaces, IW final 1st set showed that. Yes, it was a HC but slow as clay. Some guys like Murray are excellent slow HC players but clay just doesn't suit them. But DelPo isn't one of those guys, clay isn't a problem for him. But fitness is. In Bo5 against Rafa, straight-set win is almost necessary for Juan, and even the 3rd set may be too much for him. Even in Bo3, he'd almost need to win it in two. But I think he has the game for it, he just needs to play like he played 1,5 sets in IW F.