[Jim Jones]

It seems that the rankings for this week are already out. That seems bizarre. It always comes out on Monday.

 

[R.Federer]

It seems that the rankings for this week are already out. That seems bizarre. It always comes out on Monday.

I have seen it before, that they update on sunday evening (but not commonly)

 

[Fee]

Actually, there have been a number of times this year when the rankings have been updated on Sunday evening, but today may have been the earliest ever (I saw it about 2 pm Pacific time today). I believe the rankings are done out of the Florida ATP office, so if all of the Challenger and Tour results are in there by Sunday afternoon then the new rankings are usually posted. I suspect one or two people come in to work on Sundays and can get the info to their webmaster.

 

[Haute]

I've actually seen the rankings come out on Sunday the entire year for both the ATP and WTA. The WTA usually doesn't update until 10 or 11 pm EST, but the ATP is usually updated by 8 pm EST.