Gs of course count for 2 weeks
Ok I made that quick calculation.
If Nadal wins Roma, Madrid and Roland-Garros,
Federer needs 1360 points to keep number 1 by Roland-Garros , and then be certain to equal the record ... and probably beat it if he keeps number 1 after Halle/the Queens.
I can see two ways of doing it, but it mostly depends on the ability of Federer of reaching the French Open final imo
- either he reaches the French Open final : in that case, he only needs a final in Estoril
(and take part in Madrid) or a quarterfinal in Madrid
(or a semifinal in Estoril and a R16 in Madrid) to keep number 1 after Roland-Garros
- either he doesn't reach that French Open final : in that case, he needs all of these conditions to apply : reach Madrid final, Roland-Garros semifinal and win one match in Estoril
Note that if he's a little bit short (for instance Madrid semifinal), he still has a chance of breaking the record if he wins Halle and Nadal doesn't take part or doesn't win one match in the Queens.
If Nadal fails, well there's still Djokovic to counter : he only needs 1300 points more than Federer until Roland-Garros
, and has a very good draw here in Roma.