Weidemann is no mug, has some deep penetrating groundstrokes from what I remember, and she is quite unorthadox as she has a one handed backhand and a two handed forehand.
That's a reasonable draw for Laura against someone who has won a lot of matches this year, but usually falls short against really strong players (Pervak has beaten her easily twice in recent weeks). Chalova has lost all three matches against Brits this year (Naomi B, Emily and Bally). Arantxa Rus, who also held the junior number 1 ranking for a while last year, is likely to be her second round opponent - but the Dutch girl has struggled of late.