Tennis String Tensions

String and string tension of Tennis Pros?
Anyone know the kind of string and string tension of Federer, Murray, Roddick, Djokovic, and Del Potro? and who do you think will win 2009 US open?
All i hear was federer uses tension between 48-54 pounds
and nadal: 52-55 depending on surface and altitude.
i think its fed or nadal.
i dont really like fed but hes in good shape and playing his best tennis
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