Both. He have talent and is great athlet. I think now is time for him to stop clowning around. In 1 year i hope he will playing finally as tennis player - more thinking on the court and better tactics- more agressive. If he even in 1 year from now will be the same guy i think he is done - in term of potential. He has great potential, but really he needs to start doing something. He is quick, long legs, long arms, great deffense already, but has potential maybe to have best deffense on the tour. Has power- strengnth, great FH, solid BH to start playing more agressively. Also his serve is pretty good, but can be much better with some spin, slice and mixing serves. With his speed he can play also SV on faster surfaces. He has everything to be succesfull in modern physically demanding tennis era, but most important he lacks for now - mental strength - it could came with age and brain on the court- for this he need good couch to teach him how to think and use all his weapons in match.