Djokovic's decision to hire Andy Murray for at least the Australian Open has raised questions about the critical psychological relationship between a player and their coach.
He needs the voice of someone who he respects and who is happy to have it out with him mid-match until they aren't.
This reshuffle at the top of the WTA Tour shows how players are seeking to renew their games and strengthen relationships with their coaches.
A technical master or a sideline hype master? Players and coaches alike have myriad decisions to make in choosing each other.
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