Very risky call, I know.. it's WTA matter, I know.. but I want to try, following my rating
Cibulkova 113,31 pts
Petrova 131,24 pts
Odds are very high, I think, if you don't want to trade the odd from 2.90 till.. don't know.. at least 1.60, you can try this pick:
Petrova +2.5 @ 2.14 (BF)
let's try, small stakes