Honza
Professional
The most sucessfull coaches havent necessarily played on a top level.First of all, his coach is a former number one and has a much better understanding of tennis.
Toni Nadal, Severin Lüthi prove you wrong and even people like Marian Vajda and Peter Lundgren were not that good. Lets not talk about Nick Bollettieri, Patrick Mouratouglou or even Günther Bresnik.
Fact is there are players that like to be coached on court and the ones that dont. The ones that like it always found a way. That starts with youth tournaments without umpires and cameras and ends with hidden signals on tour .