I think Fed will be more-or-less out of the picture soon. In the last 3 years, he's won 2 slams, and at both of those he's had a little luck as his nemesis Rafa was eliminated (even the 2009 slams were similar). He'll be going on 32 next year. I can't see him being a huge factor that
That leaves mainly Muzza, Nole and Rafa to share the spoils, though I suppose someone else could get into the mix, maybe Delpo? Tsonga? Hard to say.
The 3 of them can compete on all three surfaces but I feel like this:
- Murray and Nole could edge Rafa on hard courts, particularly fast ones like USO
- Nole and Rafa could edge Muzza on clay courts
- Murray and Rafa could edge Nole on grass courts, though that might seem odd as Rafa & Nole both have Wimbledons.
IMO, the most important thing for Lendl and Muzz to work on is Andy beating Nadal more regularly, and in best of fives. I know he has wins over Rafa at USO and AO, but neither were straightforward affairs because the first was played over 2 days and the second involved a retirement. I totally think Andy has the game to beat Rafa, but I'd like to see it happen when both are playing their best over 5 sets. I think Andy could use a little less reverence for Rafa? It might make him fight a wee bit harder in those matches? Not sure as would have to re-watch them.
So with all that said, I think Muzz should end with 5-6 slams minimum.
He should win a couple Wimbledons. Grass doesn't come naturally to the others, though Rafa will always be a contender there, and Nole won't be far off either (improved net game will help).
He will definitely win at least one AO
He will win another USO
He has 5 good years left for sure, though over the 28-9 year point players do start to slow, I think - even Fed did. So that leaves 2-3 peak years. If he wins a slam in each of the next 2-3 years, that puts him to 4 and then another 1 or 2 in those latter years, and he has 6. And that's conservative I think.
So many factors to consider that we just cannot predict: like health - will Andy stay injury-free? and competition - will anyone else rise up to challenge these guys?
But he'll do well methinks.