Here's video of the Goffin injury if you want to see how/what happened. Kind of a freak accident as Goffin was scrambling to get to a ball at the backend of the court and as he slid on the clay, his foot caught under the tarp that covers the court when it rains and he tumbled down in a heap. Of course, nothing likely happens if that tarp is stored somewhere off the playing surface.
http://www.tsn.ca/tennis/video/the-k...injury~1137972