brilliant but unpredictable.
For the past 3 or 4 years Rafa has won on clay and Roger on grass and hard court. That's just the way it's been. But now you can't say with any certainty what's going to happen next.
Federer seems capable of both beating or losing to anyone on any given day. Rafa goes on a brilliant run which is ended, against the odds, by Djokovic coming off the back of a mini slump.
Djokovic has a 4-0 head to head with Murray, and yet Murray beat's him twice in a fortnight. Murray plays the best tennis in the Cincy final and is poised to serve for the tournament, but somehow gets broken and finds himself in another tie break. It's hard to keep up!
The only thing predictable about mens tennis right now, is that it's going to stay unpredictable for a lot longer yet.