Thread: John Isners String?
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Old 01-04-2013, 04:04 PM   #11
TRVX1912
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http://www.tennis-warehouse.com/play...ccode=RFEDERER

It also says federer still uses champion choice when he has been playing with 4g

http://www.tennis-warehouse.com/play...code=SWILLIAMS

And Serena only playing with 4g when she uses a hybrid
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