Well, he just turned 13 so it's hard to give some solid predictions.He is extremely talented but becoming a teen is the most sensitive period...along from transition from juniors to pro tour.Many talents were lost there.
For example Milojevic successfully translated his game when his body started to change 2 years ago and is by far the best prospect in his age.He will be 14 in a month and is already beating 18 yr old juniors.That alone won't mean anything if he doesn't make it when he goes pro in few years.
Borna is too talented and will most likely make it and have a nice career but for something more certain we should wait for 1-2 years.
i don't know because some menager from IMG(his surname is frankopan,he is menager of bernard tomic,soo very good one)said for coric that he didn't see something like that from murray in that age but on the oder hand some poster from croatia said he is soo good because he is training alot.but i think that isn't correct.i mean menager is most competent than some poster.
one mistake,coric will turn 13 in november.i know he won against milojevic in final of moskva in last november,but like you said he is so young.
milojevic is way better now.that is quit understandable for me(it was just half years ago) because milojevic starting to to play like this on the start of the season,so just 2 months after that match.so it seems that is very fast changing things at that age.is that true?
he has very good requirement.he was born in zagreb,but he is in the best tennis club in croatia,tk split.
he is 5rd in the U-14(he was 2nd) and he is the youngiest in the top 10.quinzi is 2nd youngiest,but he is about 10 months older(there are saying quinzi is a big talent).there are only two others in top 30 from generation 1996 and overall about 10 in top 100.all of them are older than coric about 6 months or more(except one boy which is 3 months older,that boy is 94.).
the boy which is born almost at the same date as coric is 129., so it's seems coric is something special.and coric is quit small for his ages so it's not that coric is stronger than others.