Yonex Muscle Power I graphite racquet with open throat, 90 square inch head. Isometric Head Shape. Used by Lleyton Hewitt in 2004 and autographed on the handle. FUN FACT: Yonex logo has a double YY because originally the founding company in 1947 was named Yoneyama Racquet Co. Ltd. until it was renamed Yonex in 1974.
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