Fratangelo could have been an excellent #4 at Virginia and most likely experienced a national title. He could have practiced against Mitchell Frank, Jarmere Jenkins, and Alex Domijan every day.
People talk about how many hours a day you can devote to tennis when you turn pro, but is it actually true? What happens when you lose in the first or second round of a pro event? Do you hang around the rest of the week getting practice matches in against other guys who lost? Do the other guys actually hang around, paying for hotel rooms? Perhaps if a local family hosts you, it is possible to hang around.
There are a lot of questions to answer, and a lot of assumptions made about how much quality time you can put in as a pro. I would be glad to actually hear what a typical week is like from someone who played Futures for a year.