Simona Halep and Agnieszka Radwanska are the two possible contenders for the semifinal slot in their side of the draw.
Simona has relatively more clay court success, but in their head-to-head, it's Agi who leads, so she gets my prognosticator's nod.
Interestingly though, Agi has only reached one QF here in RG, and that was three years ago! Her performances after that have been poor to say the least.
Her 2016 clay court season has also been so-so, with just a semifinal loss in Stuttgart. So in a way, Halep has a good chance to getting the semi's slot here and maybe go all the way to the final.
Simona has already been in one RG final so if she is just consistent enough, this might be the year for her!