Some good ones mentioned already:
Venus- most tall players don't move like her and don't bend like she does. She can handle low balls with relative ease.
JCap- she looks a lot slower than she really is, as mentioned above.
Mauresmo- she looks like she's pure power, especially with her muscular physique and broad shoulders, but in actuallity she has great touch and feel. The irony is sometimes she could use a little more punch in some of her shots.
Justine- she's so short and frail looking, but she's got just as much fire power as any of the 'bigger' girls on tour.
Lindsay- she looks like she would be a grunter on the court, but she's actually one of the more quiter players on tour.
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