Originally Posted by Pro_Tour_630
The data shows that ATP and WTA players have grown up using softer balls.
This is the only sentence I would quality - starting on soft balls is very different than growing up on them. There is no way an ATP or WTA player today started on soft balls at 5 or 6 and was still using them at 9 or 10. I don't think any kid should be mandated this. Playing up as an elite junior as you suggest, yes. But intermediate kids should be able to progress too - which leads me back to green ball for 10s, so I'm with you on that.