I've noticed a lot of juniors with Lux and multiple colored polys but have seen and heard complaints of shoulder and arm issues. What are the top Junior players using and what tensions are you using. I know that the pros have some of their setups listed, but was interested to see the variability of the top juniors. Would be a great sports medicine study for preventative medicine as it relates to string type and tension. I know one that uses a hybrid lux for the mains at 54 and gut on the crosses 56. Another boys's 16, told me that he strings Lux at 59, which seems fairly harsh. But I suppose if it varies widely and would like the information. I've just found out that the big kid from Canada, Raonic, strings his racquet in the mid 40's.