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Mattek-Sands has suffered injuries to the same knee in the past, as recently as 2013<p>American player Bethanie Mattek-Sands, the Doubles World No. 1, had to be carried off the court on a stretcher Thursday with a right knee injury. Mattek-Sands injured the knee after she planted her right leg …

Read more at CBS Sports: http://www.cbssports.com/tennis/news/watch-bethanie-mattek-sands-yells-help-me-after-crumpling-to-wimbledon-turf-with-knee-injury/