I think the best word to describe that is "encouraging". Andy sounds like a student of the game, and that explains the intelligent tennis beyond his years. If he keeps on learning I'm left in no doubt he'll get right to the top.

What he really really needs now is to develop a weapon, as well as ridding himself of his liable serve. He has an exceptional ability to break players, but unless the conditions help him to get a bit of bite on his serve, he'll rarely go a set without dropping serve once. If he can sort that out then he is incredibly dangerous. People do not fancy serving to him already. Imagine what he'd be like if he could blast out cheap games more often on his own serve.