Who else? Serena is not winning it - look at her slam performances lately, Sharapova will lose to Ana anyway, Halep is overrated, Genie is overweight and in terrible form, Kvitova too inconsistent to repeat W run, ...
The field is open and Ana is capable of winning ii, if she could keep it together mentally and not choke/selfdistract.
Your pro-Serbian racism is absurd. All year long you pick Ivanovic (and Djokovic) to win everything, and you are wrong most of the time. Ivanovic is not a strong player who can mow down the field--which is supported by the fact she was only able to eek out one major in her career.
Her best USO result was a quarterfinal in 2012, and we know the how and why that crashed and burned: she faced a superior player named Serena Williams--a clinical, powerful defeat of Ivanovic repeated this summer.
Bouchard is overweight? Prove that. No--you cannot.
Both Halep (2-1 H2H over Ivanovic, including Madrid '14) and Bouchard (2-0 H2H over Ivanovic, including the 2014 AO) are on the rise. I know that pains you, as it just adds more threats to the field.
You are bitter--hating anyone who is not Serbian, hence your attacks on players who have victories (particularly recent victories) over Ivanovic.
There are no sure things about who wins the USO, but your motives are clear--and not based on rational observation.