Juan Martin del Potro was riding on a 23-match winning streak that included wins in his last four tournaments -- on clay at Stuttgart and Kitzbuhel, and on hard courts at Los Angeles and Washington that sent his ranking soaring from 65 to number 17.
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The 19-year-old Argentine, who was bandaged above and below his left knee and was limping toward the end of the quarter-final, had traded on court insults with Murray at the Rome Masters in May.
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