Yes, I have a friend who started losing hair in high school. Doesn't happen that often, no? Also did you lose your hair the same way as Nadal, Murray and Gasquet? It is very similar how they are losing their hair. Normally everyone will lose hair differently, or will you deny that as well.
Did 20% - 30% of your friends also lose hair by mid 20's. Sports are becoming a big joke, and it is more than obvious that there are many cases of wrong doing.
Hair loss, huge muscles can be a give away, that is all I am saying.
Berdych has cankles instead of knees. Serena can beat up 95% of male tennis players, in a street fight. Stosur can bench more than 99% of geeks on this forum.