This question has been repeatedly popping up in many threads so I decided to answer it here via a link to an old post:
http://www.menstennisforums.com/showpost.php?p=2135374&postcount=59
Any further inquiries may be posted here.
http://www.menstennisforums.com/showpost.php?p=2135374&postcount=59
Any further inquiries may be posted here.