In the short term I think Ferrer's almost certain to do it, unless Rafa pulls something amazing out the bag and reaches
at least the AO SF. However, in the long term I think there might not be a "top four"; the current era just happens to be an unusual circumstance. Look at how things were prior to Federer/Nadal in 2005...
2004:
- Federer
- Roddick
- Hewitt
- Safin
2003:
- Roddick
- Federer
- Ferrero
- Agassi
2002:
- Hewitt
- Agassi
- Safin
- Ferrero
2001:
- Hewitt
- Kuerten
- Agassi
- Kafelnikov
2000:
- Kuerten
- Safin
- Sampras
- Norman
1999:
- Agassi
- Kafelnikov
- Sampras
- Enqvist
1998:
- Sampras
- Rios
- Corretja
- Rafter
1997:
- Sampras
- Rafter
- Chang
- Bjorkman
That's eight times in a row where there were at least two new faces in the top four every year. The stability at the top that we've had for so long is pretty unprecedented in my experience; I have a feeling that when the current guys' time is over, it'll go back to the [less predictable] way it used to be, at least for a while.
Regards,
MDL