With the elimination of Roberta Vinci in the first round, Petra Kvitova (#12) of the Czech Republic, becomes, on paper, the most likely player to reach the semi-final slot on their side of the draw.
However, like Venus (on her side of the draw), Petra Kvitova is not really known as a clay courter, but she has reached the semi-finals here once, in 2012, so she may be able to do it again.
There are, however, some very good clay courters on this side of the draw, who can give Petra good competition. There's last year's finalist Garbine Muguruza as well as former champion here, Svetlana Kuznetsova, who is currently playing well on clay this season.
This mix of great players and good clay courters makes the match-ups very interesting!