Djokovic, del Potro reach Wimbledon semifinals (Yahoo! Sports)

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LONDON (AP) -- The spectators were still settling into their seats when Juan Martin del Potro chased an overhead into the corner, only to feel his foot go out from under him on Wimbledon's slick grass. Del Potro's knee straightened suddenly, then bent backward. The 6-foot-6 Argentine crumpled to the ground and rolled twice into the far edge of Centre Court.



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