1. Clay Monster
Best on clay ever, without a doubt. Sure Borg's record on clay is the best on paper, but in those days the players hadn't developed those particular claycourt tactics: hysterically massive topspin, never missing a shot, etc. I say that Borg's game would lose to Nadal's on clay every time out. Nadals game us tailored 100% for clay. The only reason he also does well on other surfaces is because he's just that good, despite playing a game that is seriously flawed on faster surfaces.
2. Federer
Best player ever. Would have dominated on clay for the last couple of years if it hadn't been for the appearance of the Clay Monster. Question marks looms this season, as Federers baseline game seems to have deteriorated, now relying more on serve and shotmaking. He's more error-prone and might not do as well as expected this clay season. When in JesusFed mode, he has the tools to defeat the Clay Monster, as proven in Rome 2006, when he should have won, and last year at Hamburg, where he beat a very tired Clay Monster.
3. Djokovic
Fast improving and already an RG semifinalist last year. Doesn't stand a chance against the Clay Monster on clay, but is probably around 50/50 against Federer at the moment.
4. Ferrer
A spaniard who's actually better on faster surfaces, but his game has improved and should be great for clay.
5. Nalbandian
You never know with Fat Dave. I had to include him simply because he's the single worst match-up for the Clay Monster.