Roger Federer was leading 4-3 in the 4th Round of Wimbledon 2012 vs Xavier Malisse, then all of a sudden, he took medical time-out.People are speculating about the injury..........Just for information, he took an off-court treatment...Every one is speculating if it is groin or some thing else..According to our informed sources, this injury is a lower back injury that his hampering his movement.Hop