Young Russian has really impressed me so far, he hasn't fully developed yet physically but has beautiful shot making and he's already able to compete with much older players. Djokovic when 17 y.o. (2004) was nowhere near as good if I remember correctly. In juniors never won a slam nor was no.1 like Andrey. But Nole improved dramatically in later years (19-20) and made a breakthrough in top 5. Who do you think is more talented?