according to her profile on the wta site it was in 2000:
2000 - Collected third career WTA Tour singles title at Klagenfurt as No. 1 seed; reached Australian Open and Roland Garros 4r, l. to Sanchez-Vicario in 3s both times; d. No. 5 seed Coetzer and No. 3 Tauziat en route to Zurich SF; reached six more QF; struggled with nagging injuries; withdrew from Paris and Hannover in February w/stomach muscle injury; retired at Hamburg and withdrew from Strasbourg in May with sinus infection; retired vs. Davenport at Linz with infected right toe
she was in the top 10 in 1999 and in 200 reached the 4th round of the first 2 grand slams. then in the last 2 reached the 1st and 2nd round. so i'm guessing that those nagging injuries and sinus infection was around the second half of 2000.
maybe she wasn't in the top 10 at that time, i'm not really sure but on her profile it says her end of year ranking in 2000 was #23 whereas in 1999 it was #8.
Go the aussies! stosur!!!
and good luck russians: dementieva, safina, kirilenko, sharapova, kuznetsova, bovina, zvonareva, dushevina.
also good luck to: azarenka, lucic, sprem, vakulenko, vaidisova, safarova, ivanovic, groenefeld, mirza, krajicek, kvitkova, larcher de brito, lisicki.