Here is US Open check-point:
R3-3562 R4-3612 QF-3722 SF-3922, F-4172 , W-4472 - Ana IVANOVIC
R3-3355 , R4-3405 , QF-3515 , SF-3715 F-3965 , W-4265 - Jelena JANKOVIC
R3-3181 , R4-3231 , QF-3341 , SF-3541 , F-3791 , W-4091 - Serena WILLIAMS
R3-3070 , R4-3120 , QF-3230 , SF-3430 , F-3680 , W-3980 - Elena DEMENTIEVA
R3-2997 , R4-3047 , QF-3157 , SF-3357 , F-3607 , W-3907 - Dinara SAFINA
Before seasons last slam Ivanovic have clean advantage in points, but after "perfect" draw Jankovic chances is actualy good to overtake her again.
To back again at Serbian #1 Jelena Jankovic needs just to beat today Sybile Bammer (lead 6-1 in h2h) in USO QF. If she reach final (against Dementieva probably) she have good chances to stay at #1 for long time.
Bad things is that if Jelena not reach USO final since next week Serbian#1 will not means Worlds#1 in same time, and if JJ reach final, but lose - she will be WTA#1 if USO Winner is not Serena.