After plenty of drama in which Serena Williams was even docked a point for what was dubbed as receiving on–court instructions, tennis effected a remarkable volte face on players getting coached on the court. But the always-enterprising Australian Open, couldn’t really have let the opportunity to have Andy Murray sit out with his usual poker-face in the box for Novak Djokovic. In what has been a refreshing addition, the year’s first Grand Slam welcomed fragments of on-court coaching, though not quite mic’d up. Badminton, far tinier and literally more scrunched in court space, that’s been playing out in the vicinity in Indonesia, will let out a quiet chuckle. Though not quite inevitable, reactive coaching, and improvised interventions, can only add to the drama and watching-experience of an individual sport. The arguments against allowing coaching on court, are pretty straightforward. Players ought to think for themselves and pit their brains in one-on-one battles against each other. Why should they be spoon-fed tactic tweaks? Then there is the perennial time-crunching battle that all sports are forever engaged …