Sheddie wrote:

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thinking about it....it's going to really favour whoever is on the clay side as the person on the grass half is going to be struggling to make any headway in the rallies while watching winners fly past them.

Simply because he's the more aggressive player and so will be able to take advantage of this more...I think Federer will win

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I think that the split in the surface should be the other way , down the centreline. I.E.  Forehand court grass and backhand court clay for one player and vice versa for the other player (for r handers anyway)

Come to think of it it'd be better still with a quatered court - grass, clay, carpet and concrete. Perhaps tarmac for the tramlines if it's going to be used for doubles.