Jannik Sinner talked about himself in Eurosport’s Players voice column, before the start of the Master 1000 in Rome, but he also talk about Roger Federer. He said: “I would like to grow physically and mentally, where I know I have a lot of margin.At this age you cannot be complete. Then there is the most important part of all to work on: tennis.” The Italian player immediately, aware of his own means and on the level it could reach with hard training, then confessed: “If …