This is the first time they have played one another.
Petkovic has avoided getting out of bed on the wrong side as she did last week for her match with Garcia. She came through her first 3 matches without dropping a set. She had a good win over Muguruza in 3 sets.
Ostapenko has over performed this week. She has beaten Kuznetsova and Kvitova. She has had to work hard for her service holds.
Unless Petkovic drops her level today I don’t see Ostapenko winning. This is Petkovic’s match to win or lose.
Petkovic starts around 1.53 but I will wait for a minimum of 1.75 before backing her.