I kind of don't like the fact that this is Andreev's first match on Clay, switching from Hard - but he has a good H2H record against Montanes. And Montanes has been playing fairly poorly in his last several matches on this surface, so I believe Andreev should be able to take care of business.
And Vinci has been pretty solid on Clay this year and don't think she'll have much trouble with Mathilde. Haven't seen her play much but her record pretty much speaks for itself, and don't see her upsetting Vinci.