Novak Djokovic and Andy Murray chatted mid-match thanks to the new Australian Open coaches' box

MELBOURNE, Australia (AP) — Novak Djokovic stood with his hands on his hips, listening intently to Andy Murray — his longtime on-court rival and now, stunningly, his coach at the Australian Open — between sets at Rod Laver Arena. Murray pantomimed the swing of a two-handed backhand. Djokovic...