Never had a problem with hamstring or groins. All the sudden last Weds night I felt something in the right one scrambling to chose down a hard shot in singles. Continued to play but it hampered my movement. Then on Sat. again playing singles, again scrambling to retrieve a shot, felt the same thing in the left hamstring, back of thigh/groin area. Never had this before now both in the same week and the soreness is still there. Maybe it's the reality of playing hard 4.5 singles in mid 40s on very dry har tru. Or maybe I didn't warm up enough, pretty much got there late and rushed into the match with a rush warmup. Any advices are welcome. Thanks.