-huge and EFFICIENT serve
Are you serious? - brain- he is thinking much more than before, but ok he is not mentally up there with top 4, balls-ok, consistency - since last year he is pretty consistent guy and last 3 seriusly? who has bigger serve from top 4? nobody - Roger has probably better serve thanks to variety and good 2nd, but bigger serve nobody and better maybe Roger, volleys- besides Roger and Jo and Mardy he is 4th best volleyer in current top 10, he is for sure one of better volleyers on the tour.
About talent no words - he is one of hardest hitting on the tour- flat clean shots, he is very talented guy for sure with average movement, deffense and return and bellow average mentall toughness it must be talent that keeps him up there in top 10 don´t you think?