It's interesting how different Sharapova's shoes are from the retail shoe..
Aside from minor things like tread pattern and the toe box material hers also have a different shaped line/cut around where the foot goes in - hers is more rounded whereas the retail shoe is angular.
The notches in the plastic support frame on hers are much further back in the fore foot also - lining up with the second triangle cut-out part whereas the retail one is close to the first cut-out part.
Hers also have no plastic parts on the inside foot above and below the swoosh like the retail model. Likewise, the border of the white and yellow materials on hers are stitched, unlike the retail model (or Fed's custom jobs for that matter)
She must be really
particular about her footwear.