Re: Diego Sebastian Schwartzman
You can see some videos of him on youtube.
He improved a lot last year, like other players of the same age from Argentina (Arguello, Velotti and Andreozzi). In my opinion Andreozzi is the better of them at the end of 2012, but he's the older.
I think Schwartzman is a bit short and lacks of power to reach the top 100 right now. He has a good touch of ball.