I think any athlete who played junior high sports at the highest levels of his school, had good coaching, was interested in the game, AVOIDED injuries, could make the top 200 in ATP.
Unfortunately, 90% of rising sports athletes get injured, sets them back a few months, which works out to be TRIPLE the setback of someone not injured.
Coaching is easy to find. Athletes are easy to find. Interest is much tougher, but very few can overcome the injuries during the formulative years.