I have missed the chance to watch Daniel play due to bad luck. But quite a few of my friends have seen him in action, and they were mighty impressed.
He is said to be a really versatile shot maker and has a game that suits all surfaces. And watch out for that return of serve that he has! If he trains properly, that can be a big weapon in the years to come.
But he is physically really weak and needs to grow quite a few inches more. The serve isn't that good at this moment as a result of his height. He can struggle against big hitters. He also tends to make many unforced errors at times.
By the way, he happens to be really fiery for a boy of his age.
He shouts and swears and grumbles when he is not happy with line calls.
He is working on his weaknesses. He spent a few months in Marbella this year and may as well return next year. Just wait and watch till he develops a good serve, he can be world class.