NPK said:Why does a top player even need a coach? Federed is a better player than his coaches, and he knows how to play.
Tactics. Players can't go and watch all the other players, to see how they play. Same as football players are better players than their coaches, but they still have coaches.
Most top players have a 2-3 coaches, plus a stringer. Agassi travels with 4 coaches + a personal stringer.