Re: Who is greater, Svetlana Kuznetsova or Ana Ivanovic?
Kuznetsova has had the greater career.
BUT, Ivanovic won all of her important titles in a very rapid succession. From April 2007-June 2008 she had a better hot streak than Kuznetsova has had; Kuznetsova's biggest accomplishments have tended to come more spread out ('04 slam title, '06 Tier I title, '07 QF streak, '09 slam title, etc.).
I don't buy the "Ivanovic as #1" bit, though, because if I remember correctly, Henin would have remained #1 through the U.S. Open if she had elected to NOT have her name removed from the rankings. Ivanovic was a real place holder. She was the best on tour in that stretch, but I don't think anyone can argue she would have been #1 without Henin's 'retirement'.